We spent 3 night's at Julian David's room.
Julian was very respectful with us and we never knew he was there most of the little time that we spent there when we were not exploring the city. He gave us a copy of the keys to be able to go in and out as we liked.
The bathroom was clean and well equipped. The room was just as expected, with a lot of space.
However the room is in a 4th floor with no lift and the area of White Chapel St. had a lot of people sleeping at the street, which for some people could be worrying. We had a little bit of difficulties finding the place the first time.
Good thing is that it is quite near to whitechapel station and near a Santander bike renting place, as well as other facilities like markets and restaurants. The two nearest pubs had good ambience.
I think it is a good option to visit London if you don't want to spend too much.