This is a great place if you look for something cheap, but you should be aware of what you get. It is a very samll room (about 2/3.5 meters wide, and 2 meters high).
It has a shared bathrrom which is not great.
It is not very close to the center of london - it is about 30-45 minutes far from where everyone is at at evening.
The good things are that it is very clean and well maintained. It is pretty available and itis suitabe if you arrive in late, because it has 24-hours check in.