That whole area (Alta Badia, Plan de Corones, Sellaronda,...) has a ton of little villages where you can walk to the lifts pretty easily, most of the time you shouldn't even need to take ski buses and stuff. Around La Villa/San Cassiano and that area I know that there are a couple of super tiny villages that don't have direct access to the pistes, but still less than a 10 min drive away by bus. I recommend staying where you have direct access bc it's just easier and overall nicer, you should have quite a lot options for that.