General advice is not to request a specific room. Request qualities that are important. BW view, water view, close to elevators, non-smoking, no palmetto bugs, etc.
Requesting a specific room will more likely lead to dissapointment. Think about it, the room controller gets to your ressie, room 1234, room 1234 is already taken and the occupants will be leaving two days after you arrive.
Your request goes ignored.