We had a perfect stay at Sarah's cosy place.
Sarah was really nice to talk to, she was absolutely friendly, answered our questions very quick and she did not give us a hard time about check-out times and stuff like this.
The flat is proper, gives you the impression of being welcome at a friend's place. It has everything you need for a short stay in London, no need to bring your own equipment - and if you water her tomatoes in the tiny backyard Sarah might be really lucky to share them with you.