I recommend David's place for every traveler who is finding a place to stay in London.
First of all, the house is clean, and there is everything you need. The bedroom isn't very big, but it's enough for a traveler, and not to mention there's a good view of a park out of the window.
Secondly, the location is good. There are several bus stops and a underground station within a ten minute walk.
Lastly, the host family are super nice. I met David's wife, and I had a delight chat with her. Though I didn't get to meet David, I can tell from his messages that he is really friendly.