I really enjoyed staying at Huma's place. The room is as beautiful as it is in the photos, the bathrooms and kitchen are clean and have everything you might need during your stay. The only small issue I had was that it was a bit cold in my room during the first couple of days (but it was October and the heating hadn't been on yet, so I guess this won't be a problem at a different time).
The house is 7 minutes away from a tube station, and there are also two or three bus stops closer than that. I personally preferred to use buses whenever possible. There are lots of them, they are very reliable, there are almost no traffic jams, and, of course, riding on the upper deck is just super fun for a foreign tourist :) It took me about 15-20 minutes to get from the house to most centrally located attractions. Honestly, I wouldn't want to live closer to touristy places because they are very busy and crowded.
The room is on the 3rd floor (called 4th where I come from), so do keep that in mind if lots of stairs are a problem for you. They were not for me.
What else... There are three supermarkets nearby, so you won't go hungry :)
The wifi is pretty reliable.
One more thing you might want to keep in mind is that there are other guests staying in the house and Huma lives there as well, so there are certain (sensible) rules you are supposed to observe in order to conveniently coexist with other people in the house.
On the whole, for me, it was a wonderful experience. The house is very beautiful, has a little back garden, a terrace and three (!) cats which is definitely a plus in my book :) I also really enjoyed feeling a bit like a proper Londoner which wouldn't have happened if I had stayed at a hotel.
Oh, and Huma is a lovely person, helpful when necessary and very interesting to talk to.
Highly recommended place to stay, especially if you travel alone like I did.