We stayed here for the olympics and it was everything we needed, a nice quiet clean room. The bathrooms and showers were immaculate and the location could not have got any better for central london. Staff were friendly and helpful.
Downsides are that the place doesn't really have a vibe as can be common with some yha's. Although the kitchen was well equiped it was missing a key ingedient of an oven which was strange. However as i mentioned above you are in the middle of the city with every possible type of food outlet on your doorstep.