We really liked our room on the top floor, with views over the street. It's a bit noisy but that's what you get for the location - but everything with the hotel was good and I would stay there again. The only annoying thing was that the Wifi didn't stretch to our room so we had to be downstairs to use it.
We had to open the window because we were hot (even though it was not a hot day), but being next to the railway line meant we were therefore woken up by trains a lot. So maybe some air con would be a good idea.
It's probably the best hostel I've stayed in in London on the whole, especially considering the price I paid (very good value). Modern, clean and spacial.
As I didn't pay much for the room I'm not overly complaining, and I have seen worse hostels, but this was very cramped in both the bedrooms and the kitchen, and I haven't decided whether to blame the hostel but the rooms were absolutely boiling (I acknowledge that it was a warm day), meaning I got very little sleep. Overall though, not too bad for the price we paid.