I would email or do online chat with Member Services, and request upper floor, other than that, I've rarely been bothered by bus noise, except in an area where the busses turn around. Remember that OKW has no elevators, except in building 62, 63 and 64, so you'll be hiking up two flights of stairs. The problem wmay be traffic noise, if your building in=s in a perimeter area of the resort near Buena Vista Drive or EPCOT Center Way/Vista Boulevard. So you may also want to request Bldgs 34. 35, 47, 48, 55, or 56. Remember that the reosrts have been very busy, and requests are never guaranteed. It isn;t like a cruise ship where the entire thing empties and loards all the guests at the same time, so it just depends upon what is available on your check-in day.