The only thing I would say about the dorm rooms is they were pretty small - one of the girls rooms had four bikes in it, and there wasn't really any room left to stand! They all knew each other, but if you were with strangers and they also had bikes, it might be a little stressful...
Apparently they had a bike storage area as well, but I didn't see that - I think most people kept them in their rooms.
Oh, and Barley came back one night and sat on someone who had moved into his bed.... apparently the bed bookings specify which bunk etc, and this bloke was determined to have his booked bunk - even if it had been unknowlingly slept in by Barley for four nights!
I was in a double - no complaints there at all, it was fab.
Good luck with it!