We spent 4 days at Roberto's apartment and had a great stay! The location can't get much better than this as it's close to the main attractions, bus, train and metro stations and nice cafes and restaurants nearby.
Check-in and communication were very easy, directions and checkin instructions were clear and we did not have any problems settling in. The automatic lock is also quite convenient.
The apartment is a tad cold in the winter months, but the AC has a heating setting which does help. We've experienced the same issue in other places we stayed in during our trip, so it doesn't seem exclusive to this apartment.
All in all, a great place to explore Milan from!