Location is beyond excellent and Federico/Constanza have excellent communication. Could not have asked for a better location in the city! The Wifi and heating/air work really well. The apartment is a small one with a tiny kitchenette, but there is just enough room to move around with a small open space in the living/dining area. The church bells of the Duomo ring many times in the late evening and early morning and you could literally throw a rock and hit them, so be wary of this if you are a light sleeper! Mattresses in Europe are typically very thin and firm, but this was on the extreme side of that equation, so I recommend being aware of that as well if you require a particularly soft situation. The patio with the view of the Duomo is unreal & I very much enjoyed seeing it in the mornings and evenings. For the level/price of the apartment, in my opinion, this is a very nice 3 star location!
Oh, before I forget, there are not an unreal number of stairs, but the stairs themselves are tall, so it could be a lot of you planned to go in and out often or are out of shape.