It was a real joy to stay few nights at Katie's. The whole apartment was beautifully decorated with lots of plants. It is very well maintained, clean, warm and comfortable. There's everything you need.
As for transportation, there are lots of buses to central London (well, the apartment is in Zone 2 so it's quite close to center already). As a former resident of South London, I am very found of this area and there are so many good pubs and cafes. It's about 10 mins on a bus to every flourishing Hip district of Brixton where you can enjoy multi-cultural cuisines in quirky local markets.
I really enjoyed staying at Katie's wonderful home. Thank you very much :)