Hi, Susan!
Disney's Old Key West Resort is one of my favorite for it's laid back, tranquil vibe. It's a great place to spend vacation, whether you want to hit the ground running every day or you prefer to spend some time at the resort relaxing.
The buildings considered closest to the Hospitality House at this resort are usually buildings 11 - 14 and buildings 23 - 26. They are closest to things like
Olivia's Cafe, where you can get a true hidden gem of a good meal, and the amazing
Sandcastle Pool.
The only buildings at Disney's Old Key West that have elevators are buildings 62, 63, and 64. None of those buildings are terribly far from the Hospitality House, and I would say building 62 is probably the closest of the three elevator buildings. I also want to mention that there is no parking directly in front of building 64, so if you are bringing your own car, you'll have to park on either side of the building, so it'll be a short walk from parking to the building itself.
You can request a specific building when you make your reservation. If you have a specific disability that will make stairs difficult for you, you can also request a first floor room OR a building with an elevator. That will help you to avoid stairs.
Enjoy planning your upcoming vacation, Susan!
Anna