We stayed for a week in Katie's flat and we really enjoyed staying there.
The flat has space and light, is lovely decorated and located in a nice and secured building.
Camberwell Green (a 5-10 minute walk), is a more authentic place than the usual tourist zones, where you will find shops to buy food or anything else you may need.
Camberwell Green is also packed with bus lines that will get you anywhere in Central London in 30 to 45 minutes.
A great place to visit and enjoy London.