The stay at their apartment was great! Even though you are in the middle of London it was very quite in our room. The ladies are really nice and friendly, gave us a very warm welcome, and were always there if we had questions or needed something. The bedroom was very cozy, the kitchen very tidy and was equipped everthing we needed and the bathroom is small but didn't miss anything. It can get cold during the night so you should stay covered up in bed ;)
Next to the flat is a Tesco were you can get anything you need if you save some money and cook for yourself. Tube and bus stations are also nearby.

We would always stay there again! :)