We stayed at Sergio's place for 5 nights during our trip to Milan. As others have noted, the private apartment is on the top floor of the 5 floor building with no elevators, so make sure you're okay with stairs. The apartment itself was in a fantastic location and very close to all the major siteseeing attractions yet far enough from all the chaos. The apartment had a great assortment of amenities and the place was very clean, the private outdoor patio was a nice touch too. Check in/out was a breeze and was able to communicate with Sergio the entire time and he responded within minutes. Will definitely come back next time we're in Milan!