As I knew before, my single room was very small and without an elevator. However, it doesn't get any smaller - I guess about 9 SQM. In the bathroom you had to squeeze through a 35 cm wide narrow passage between the sink and the door to the shower on one side and on the other side it was about 42 cm to the toilet. The room was located on the 4th (!) floor. While the first two floors have quite small steps, the last two floors have really tiny and narrow steps. When going down, you could actually only put your heel on - carrying your luggage. However, all this did not matter to me. I'm not overweight and the accommodation was quite cheap by London standards in this excellent location.
The only annoying thing was that although the connection to the Wi-Fi router in the second house was problem-free, no internet connection was possible during my entire stay. - In the main house housing the reception, the internet connection was fully functional. This of course can happen, but the man at the reception apparently didn't do anything about it when I reported it. Moreover I placed one towel outside the room to be replaced after the first night - as instructed. It has been removed by the room service, but never has been replaced - not even on request.
Summarized, a clean and perfectly located accommodation. I do recommend it. - If You don't have to rely on wireless Internet in your room and don't mind the stairs and a tiny room.