This a wonderful flat. The terrasses are perfect. the location is exactly what you need to visit everything by foot, it is perfectly central (of course we will still have to walk a lot).
As explained in other comments, brace yourself for the stairs. But it is a good way to digest your pasta and it is far from impossible. You'll just end up breathing hard.
Check in and communications with Emiliano were perfectly smooth and nice.
Highly recommended.