The room is pretty small, with shared bathroom: this is clearly written at the booking stage and it was what I was expecting.
The main advantage is the position, in the very center of the city. I stayed there for the Edimburgh marathon and it allowed me to sleep for a reasonable price (if compared to the hotels) in a very strategic position, close to the marathon start, in the center, with no need to take any public transport.
I was completely satisfied of my stay.