Came out here with my wife, our two children (ages 22 months and 8 years) and my father (80). The location is great, right next to the pool and tennis courts, and on the grounds of the Sun Valley Resort. The condo is clean and spacious. The steps to the third floor are not a problem and easily managed by seniors.
The one concern I would caution others about is that the condo is on the third floor and there are many potential dangers for small children. For example, the deck off the Master Bedroom has railings that are spaced far enough apart for a small child to easily fit through without much effort. The interior handle on the door that leads to this deck does not have a deadbolt, and thus a curious child who is unwatched for a few seconds could easily wander out there. We ordered and installed a baby gate on the door casing to prevent this from happening. Similarly, there is a built-in bench in the family room with a large window next to the bench. The window latch is an older version that is easily moveable, which allows the large window to swing outward (not on a crank). Any child standing on the bench who moves this latch would fall out the window in a split second (three stories up). Again, to mitigate this hazard, we installed a baby gate within the window casing to prevent our 22 month-old from exploring in this area of the living room.
All that said, we do intend to return to this condo - but with the same precautions we took the last time.