Everything that I want to say has already been said, but I will say it again... the location of Enrico's apartment is perfect!! We knew we were going to be very central but were still surprised when after walking less than 3 minutes we turned the corner and the majestic Duomo was right in front of us! Also the apartment is just a 1 minute walk from one of the entrances of the elegant Galleria Vittorio Emanuele II.
Out of all the places we stayed during our 2 weeks in Italy, Enrico's felt the most like "home". It was really easy to kick back and relax when returning to the apartment, and we sometimes forgot we were visiting and didn't live there! The building itself is very secure and safe with a beautiful courtyard.
My only warning would be that the elevator is tiny and the apartment is on the 4th (top) floor of the building, so keep this in mind if you have a lot of luggage.
Overall, we had a great time and Enrico's place made us wish we had scheduled a couple extra nights in Milan. Highly recommend! We plan to come back!