The flat is very well located to visit London. 10 minutes by walking to go to Tower Bridge.
We used buses very often: the stop of C10 line is next to the flat and less expensive than the subway (Bermondsey station is at about 700 meters). To go to Westminster abbey or Buckingham, you only need to change bus at "Elephant and Castle" station.
The flat is a little bit noisy when windows are opened due to circulation on the road.