I've been told that the YC isn't big on specific room requests. I did fax a short, general request (quiet larger room on an upper floor, with a garden view if possible) before we arrived last week, and I was thrilled with the room they gave me. It was nicer than I had hoped, and the view was incredible.... more than half the boardwalk- and from the balcony we could see the fireworks from Epcot every night. We had room 4125. It was a larger standard room, on the fourth floor (fifth is concierge) on the corner. I'll post pictures soon.
If I could request it again, I would in a heartbeat.
Good luck
Sue