As others have mentioned, not for those with mobility issues, the stairs can be brutal if you're not in good shape. We were prepared for that though and it wasn't an issue for us. Really just an excuse to order extra dessert.
The hosts were lovely, super easy to communicate with, and Deborah greeted us at the apartment. She also gave lots of great recommendations of what to see during our stay. They also have maps, brochures, and magazines we found useful.
The apartment was beautiful, stocked well, a perfect amount of space for two people. The balcony is small, but just fine for our use. The location cannot be beat; close to the old town, shopping, dining, everything was walkable.
We'd happily stay here again if we get another opportunity to travel to Lyon. Not a single complaint!