Yeah, I got a letter with the new college handbook and asking me what day I'm going up next year.
If it's room number 13, 14 or 15 and on staircases G onwards then it's a top (4th) floor room. With the exception of a "Value" room which is number 13 (I THINK it's 13, might be 15) all these rooms are garden facing... this is because the staircases on corners have three value rooms on the top floor rather than two standard plus ones, and as such one isn't garden facing.
If you have a low number on G onwards you have an ensuite on the first floor. If you have a 9, 10, 11, 12 you're sharing a bathroom with one other and on the third floor.
Also staircases H and I are above the auditorium meaning they don't have their own staircase to the ground... you have to go up G or J and along one of the walkways to get to H or I.
If you're on K or Q congratulations you're on a staircase with a lift. Any other staircase you can take these lifts up to the 2nd floor walkway and walk across.
As for A through F it's all different as there are ground floor rooms and basement rooms at garden level.
Phew. Good luck making sense of that!