The apartment is wonderful, quiet but central and only a few minutes walk to all the historic sites. The hosts were soo kind and greeted us personally with a fridge filled with food, even a bottle of prosecco. The apartment was super clean and absolutely lovely, air condition in all rooms.
We have stayed in many Airbnbs but this is the best one we have stayed in.
If possible we would give Costanza's apartment more than 5 stars.