The easiest way to make a room request is to call WDW Reservation at 407-939-7630. Typically you should do this greater than three days away from arrival. (The rumor is that at three days the reservations are transferred to the resort and initial room numbers are identified.)
When you call in be as specific as possible without going overboard. Don’t ask for a specific room number. Odds are you won’t get it but you can ask for a range of rooms (odd rooms 200 thru 400) or you can give general directions (room in the 70’s section facing the lake).
Request for a View of the Boardwalk from a Villa Over Big River Brewery
Also limit your requests to 2-3 with the most important being first. The more you have the less likely you will get any of them.
It used to be common to fax your resort and most resorts still accept them. But it seems that more and more don’t so I suggest calling in your room requests at this time.