Exquisite stay! First of all, it should be note that the building itself looks old and scary. But do not let its look scares you. The room is in an excellent condition, so spacious, and located in a good area (with supermarket right under the building). We stayed there for 5 nights, and it was a very joyful stay.
Talking about the host, she is very welcome and flexible. She tried her best to manage our stay (given that we arrived so early and left so late) by facilitating us according to our (and new comer's) schedules. This was very helpful indeed!
Long story short, I will surely stay at this place again if I have any chance to visit London.