We had a nice stay at Pauls home, the central location is perfect for sightseeing, the tower bridge (and the next underground station) was about 20 minutes away by foot;
You should consider that the Train Station to Stansted Airport is pretty far away for a walk in the night (because the public Transport is not running in the late night/ early day); Walking is not recomended because of the thieves in the area;
we enjoyed the stay, stay healthy in these challenging days - all the best for you and your familiy!