Antonino is very friendly and helped us whenever we needed help. We had a flexible check-in which was also very good. The flat is clean and good-equipped. I think you can compare it with a hotel room. With the tram it takes about 30-40 minutes to Duomo. In the area around the flat you'll find everything you need. There are supermarkets and restaurants where you can eat tasty food for cheap prices ( I can recommend the Dai Due Fratelli, 5 min walk distance)
Overall we had a nice stay and we'll come back for sure whenever we're visiting Milan again!