FF is between three I think, as the rooms are a bit bigger. Plus in Cripps there's a seperate shower and WC room, so you won't get caught short just because your neighbour. Or in Johnrambo's case last year you won't have to wait for your shower because your neighbour is too busy vomiting. Sorry about her, btw, she is an awful awful human being. :P
Four weeks in a B room? I spent thirty weeks in one. They're perfectly ok -- you get a sink in your room and all of the wood in the entire building is oak. It's not your whole life you get to live in a building with loads of oak panelling.