Request a building number if you must, but for your own sake, please don't request a room number. Odds are that that exact room will be filled on your check-in day. The room assigner will have no way of knowing why you wanted that exact room number, and thus you'll just be given any old room at time of check-in.
Instead, request what you want in a room, such as "Barbados, close to bus stop" or "Jamaica, near the lake" or something like that. That way, there will be numerous rooms that can be assigned to you that you'd like, know what I mean???