The location is perfect, in central London and close to Warren Street Station.
Self check-in is simple and the host has kindly answered to my questions in very short time.
The room is as described, with clean towels, hairdryer, a kettle with tea and coffee for breakfast, plenty of plugs to recharge batteries.
The Wi-Fi connection is strong and I used the little desk to work on my laptop pc.
All the rooms (bedroom, shower room, restroom) are clean as well as the stairs. Please be aware that the walls are thin, as usually in this kind of terraced houses, and that the window on Warrens Street is thin too. Nevertheless I had a good sleep, since the street was very quiet during the night (between Wednesday and Thursday).
I will come back.