I had booked the upstairs room with two friends. Minsup was waiting for us when we arrived and buzzed us in. The room isn't big but we were only there for three nights and there was enough space for our things. What we loved was that the room, the bathroom and the toilet were extremely clean and the flat was well-maintained.
The room is within easy walking distance of Kings Cross and Euston. The flat is reached through a clean, well-kept courtyard. We walked there quite late in the evening and felt reasonably safe.
The kitchen had many appliances but we didn't use any because we only really used the room for sleeping.
There were two VERY minor inconveniences: we were sharing the flat with another 3 (?) guests (who were very quiet and respectful) but sharing one bath and one toilet with so many people was a little annoying. The other thing was that the radiator malfunctioned and it got really warm in our room. It was the last night though, otherwise I'm sure Minsup would have taken care of that because when we contacted him on the first day he was immediately available.
Altogether, we were very happy with this accommodation and we would definitely stay here again.