Satellite image of Trinity Square Flat's location and neighborhood.
Trinity Square Flat is marked with the symbol of the little yellow house. The location of the Tower Hill tube station is marked to the right of the flat and immediately above the Tower of London with a little circle with the red border, white interior and blue line running through the middle of it. On the upper right you'll see a similar symbol, except that the border of the circle is light blue - this marks the Tower Gateway DLR (Docklands Light Railway) station, which can be taken to the Excel Centre, the Docklands, Canary Wharf (the newly built area of London with most of London's tall, glass office towers), the Millenium Dome, Greenwich and its maritime museum, The Cuttysark (the world's last-remaining 19th century clipper ship), etc.
Tower Hill Tube Station
Tower Hill Station is the closest station to Trinity Square Flat, being just 100 yards away on the other side of Trinity Square Gardens. It is on both the Circle and District Lines, making it perfect for getting anywhere you want to go quickly.
The "Jack the Ripper" walking tour offered by London Walks meets to the left in this photo next to the small, curved wall that you see here.
London Underground (Tube).
The station closest to Trinity Square Flat (100 yards away), Tower Hill station, is at the lower right hand corner (at about 4pm on the face of a clock) of the Circle Line (the yellow line on the map). As one example of ease of travel via the Tube from the flat, if you want to go to Big Ben, Parliament, Westminster Cathedral, etc., just get on at Tower Hill and go 7 stops west on either the District (green) or Circle (yellow) lines to the Westminster station. The trip will take you about 10 minutes.
A train leaving Tower Hill Underground Station. This is by far the quickest, cheapest, most convenient way to get around London. There are so many underground stations in central London that no matter where you go, you will never be far away from one.
Route 15 Bus
If you'd rather take one of London's famed double decker buses, the Route 15 bus has three stops within a three minute walk of the flat, one of which is just one minute away. Taking this bus west from Tower Hill takes you through the middle of The City to St Pauls Cathedral, down the famous Fleet Street to the Courts of Justice, the London School of Economics & Political Science, etc.
Oyster Card
The Oyster Card is the least expensive way to travel by public transport in London, and can be used on buses, on the London Underground (Tube), and on National Rail. Click on the following link in order to learn about the Oyster Card: http://www.tfl.gov.uk/tickets/oysteronline/2732.aspx
Oyster Cards can be purchased prior to your visit to London by ordering online. London Underground, the governing body for public transport in London, can mail these Oyster cards to almost any country ahead of your visit. For more information, click on the following link: http://visitorshop.tfl.gov.uk/
Traveling with children in London: Children can travel on public transport in London for free or discounted rates, depending upon their age.
Children under 5 travel for free on buses, the London Underground (Tube) and the DLR (Docklands Light Railway) without any kind of travel pass, as long as they are accompanied by an adult. Children 5-10 years of age can travel for free on buses and the Tube and DLR as long as they have an Oyster photocard. Children 11-15 can travel for free on buses and at the discounted, child rate on the Tube and DLR with an 11-15 Oyster photocard. Teens 16 and 17 years of age travel at the child rate on buses, the Tube and DLR with a 16+ Oyster Card. Click on the following link to learn about traveling with children in London using the Oyster card: http://www.tfl.gov.uk/tickets/faresandtickets/1063.aspx#section-5
Swiping an Oyster card at the entrance to a London Underground (Tube) station.
London cabs
If public transport is not to your liking, London's traditional "black cabs" (which are not always black, as this example shows) are always readily available from any street in London. This cab is picking up a passenger near the entrance/exit to the Tower Hill tube station, on the edge of Trinity Square. There are always cabs waiting in the area of Trinity Square.
London Pass
Those visiting London as tourists may also want to consider purchasing the "London Pass". The London Pass gives you free entrance to 55 separate London tourist attractions, saving you a significant amount on individual entrance fees. The pass also saves you time as it allows you to jump to the head of any line/queue at the entrance to these sites. You can also add travel capabilities to your London Pass, so that the pass can be used on buses, the Tube and the DLR.
The London Pass, as the Oyster Card, can be purchased online ahead of your trip, and will be mailed to your home address. To learn more, click on the following link: http://www.londonpass.com/
Eurostar - Getting to Europe from London
Two Eurostar trains side by side in St Pancras/Kings Cross station, a 6-8 minute cab ride north of the flat.
The Eurostar train is by far the best way to get to the European continent from London. Eurostar is a high speed passenger rail service linking London with Brussels and Paris. All of its trains cross underneath the English Channel via the Channel Tunnel between England and France. The London terminal is St Pancras/Kings Cross, station, which is just a short cab ride (or Tube ride on the Circle Line) from Trinity Square Flat. The Paris terminal is at Gare du Nord. Trains to Belgium terminate at the Brussels-South railway station. In addition, there is limited service from London to Disneyland Paris at Marne-la-Vallée - Chessy, and to seasonal destinations in southern France.
The trains travel at more than 200 miles per hour, and non-stop service to Paris takes only 2 hours and 15 minutes, and an hour and 51 minutes to Brussels. It is therefore possible to have a full English breakfast in London (downstairs from my flat at the Wetherspoons pub, for example), and have a mid-morning croisant and cup of coffee on a Parisian sidewalk cafe. Go to the Eurostar website in order to get more detailed information and to book tickets. Right click and open a new tab or window: http://www.raileurope.com/train-faq/european-trains/eurostar/index.html?WT.mc_id=CJ.eurostar_booking_center.affiliates&collectCGIParams=1
A Eurostar train at Gare du Nord station in Paris.
Car Rental - Taking Day Trips Out of London
Although having a car in central London is not only unnecessary (due to the prevalence of both public transport options and taxi cabs) but also to be discouraged (for reasons ranging from a complete lack of parking spaces in central London, to the high number of vehicles in central London competing for road space, to a daily tax, the "Congestion Charge", on operating a vehicle in central London), you may want to rent a car in order to take a day trip out of London to see a a place such as Stonehenge or Oxford. If you decide to do this, there is, conveniently, an Avis car rental agency a 5 minute walk east of the flat at the north end of Tower Bridge, next to the Guoman Hotel.
This makes car rental extremely easy as you can just walk 5 minutes east to Avis and pick up your car in the morning, take your day-trip, return in the evening, and walk 5 minutes back to the flat and you're home. To go to the Avis at Tower Bridge website, right click on the following link and choose "open a new tab or window": http://www.avis.co.uk/CarHire/Europe/United-Kingdom/England/London/Tower-Bridge-Guoman-Hotel
The map to the left shows the exact location of the Avis centre. The flat is located halfway between the box that says "A3211" and the marker for the Tower Hill Underground station. As you can see, you just walk around the Tower of London to get to Avis.
Tower Hill Station is the closest station to Trinity Square Flat, being just 100 yards away on the other side of Trinity Square Gardens. It is on both the Circle and District Lines, making it perfect for getting anywhere you want to go quickly. 
A train leaving Tower Hill Underground Station. This is by far the quickest, cheapest, most convenient way to get around London. There are so many underground stations in central London that no matter where you go, you will never be far away from one. 
If you'd rather take one of London's famed double decker buses, the Route 15 bus has three stops within a three minute walk of the flat, one of which is just one minute away. Taking this bus west from Tower Hill takes you through the middle of The City to St Pauls Cathedral, down the famous Fleet Street to the Courts of Justice, the London School of Economics & Political Science, etc. 
Swiping an Oyster card at the entrance to a London Underground (Tube) station. 
If public transport is not to your liking, London's traditional "black cabs" (which are not always black, as this example shows) are always readily available from any street in London. This cab is picking up a passenger near the entrance/exit to the Tower Hill tube station, on the edge of Trinity Square. There are always cabs waiting in the area of Trinity Square.
Two Eurostar trains side by side in St Pancras/Kings Cross station, a 6-8 minute cab ride north of the flat.
A Eurostar train at Gare du Nord station in Paris.
The map to the left shows the exact location of the Avis centre. The flat is located halfway between the box that says "A3211" and the marker for the Tower Hill Underground station. As you can see, you just walk around the Tower of London to get to Avis.