I can't think of any better place to stay in London - with Ann as a host you are definitely in good hands.
Before the trip she will even provide you with all those infos you might need (about railroad tickets etc.) and makes you feel very welcome once you've arrived.
Everything around the house is super clean and tidy, the bathroom is very roomy, and the house itself is located perfectly so you only have to walk about 100 meters to get to the next bus station.
Whenever I'm in London, I would always come back to Ann.
Thank you for having me!! I had a great time!!