TL/DR: for the position and price, a very good deal for visiting London in a couple of days.
Nice little guest house, close enough to the city centre and to public transportation.
I had a single room, which was not big, but spacious enough for the time I spent inside, and a comfortable bed. The room was at the first floor, towards the street, hence there was some noise (I'm a light sleeper when I travel).
The bathroom is small and the sink very small, but the shower is good in size, clean and with plenty of shower gel and shampoo.
The first night the room was a bit cold when I came back, but after turning up the electric heater it was perfect.
I also used the kitchen in the morning to prepare tea. The kitchen is small, but I was alone, and the crockery was clean.