We had a great stay in this apartment. It is centrally located, an easy walk to all museums. The view of the Duomo is breathtaking. Communication was easy; the building manager, Jae, is extremely helpful. I would definitely stay here again. Lots of space for two couples. One bedroom has a loft space with another bed, so definitely room for more people.
Note about stairs: there is an elevator in the building to the second floor, where the apartment entrance is. Once you're in the apartment, however, it is quite vertical - bedroom and bath at entry, 2nd bedroom on the next level, bath and kitchen on the third. Not a problem for us, and lots of privacy for two couples, but something to know.
We had plenty of hot water and the appliances are in good shape. Small grocery store down the block (Conad). It was a wonderful place to stay in a beautiful city.