Like other reviews mentioned, the main unique items about this apartment is that it is at the top of the stairs (5 or so flights with no elevator) and has a gorgeous view on the terrace. It's a good amount of stairs, but I felt accomplished every time I made it to the top. We were only here for 2 nights and wish we could've stayed for longer. It was beautiful to sit out on the terrace and enjoy the view.
The location is great. It's only a block or two from the Duomo and has a lot of shops and restaurants nearby. It's perfect for walking around everywhere.
Ada is also easy to reach and responds quickly. We'd recommend staying here and would love to stay here again in the future if we're back in town.