I had a very pleasant stay at Khadija's home. The house is conveniently located close to public transportation, in a nice area. The room is comfortable, the bathroom was clean and it looks like it was recently renovated.
The room is on the third floor of the house, so keep in mind that you have to carry your bag up and down the stairs (not a big deal, but worth pointing out). Also, I didn't get keys to the house but had to knock on the door every time (also not a big deal, they seem to be always there and very happy to open the door for you).
Overall, very recommended place if you want to stay in London.