Well, again, all buildings have elevators, so there's no specific building recommendation based on elevator need. There are several bus stops throughout the resort, so "close to a bus stop" is a good request. "Springs", which is near the main building and main pool, is good, but popular - and keep in mind, requests ARE merely requests.
The one time I stayed there, I ended up in the Paddock section - "E" on the map Sue linked. I don't recall the room number, exactly, but see the label for rooms 5101-5436? Well, my room was under the "6" on the first floor. It was an easy roll to and over the bridge (although I did get discombobulated trying to get out of the pool area!). There's a bus stop just to the right of the building, and a pool, playground, laundry room for the studios right at the end of the parking lot.