I strongly recommend this host.
We stayed on Nigel's home for three nights and it was an excellent experience for me and my girlfriend. Overall, here are my best points:
1. Nigel's very friendly and communicative. He was in touch before we've even left for London and provided tips on how to arrive. Once inside, we were welcomed by five cheerful dogs. Every time we met, he was always interested in chatting and offered a couple of local tips.
2. The place is very tidy and sparkling clean. I'd dare to say one of the cleanest place we've been so far. Even though we did not use it, we had the kitchen at our disposal, as well as all the other amenities that come with it.
3. The location is great. 5-10 minutes from Shepherd's Bush station and 5-10 minutes from Hammersmith station (From where you can take a tube directly to Heathrow airport). There's also tons of pubs and restaurants nearby, as well as one of the biggest shopping centres in Europe (Westfield).