Requesting something very specific like an exact room # decreases your chance for success since you never know if that room is already occupied by someone staying longer then you are. General requests (i.e. near an elevator or a higher/lower floor) seem to have a greater chance of being met.
Which is why I said what I did above. The pre-populated line does not say one room unless altered. It reads something like "Bldg 2,Flr 3,NE-facing room.Exmple:2332,2331,2330,2329,2328,2327,2232,2231,2230" which is in room assigner-speak and lets them know the general view you would like. Then in a larger box, you can prioritize your requests. That section of mine sent today says this:
"I have a River view room booked, and I would love:
1st priority - top floor and
2nd priority - corner room.
I'll be arriving late at night (probably after midnight) - so the closer to the lobby I can get the better - I do understand that the river is on the opposite side of the resort though.
Thank you so much!!
Have a Magical Day!!"
That way, the assigner knows from the pre-populated line the building and area I would like. Then my wording lets the assigner know that my top priority is a top floor room and my second is a corner room.
So if all works well, the assigner will look at Building 2 Floor 3 to see if there are any rooms available. If there are, the assigner will look to see if any are corner rooms.
My explanation gives them more information, so that can help, but is not mandatory.
I fully understand it is only a request, but when done with priority order lists for the requests, it helps them assign a room as close to your requests as possible. Sometimes it just isn't.