We stayed for three nights at Marco's apartment and loved it. Marco is a terrific host, the best one I've ever met. He helped us take our luggage up, explained everything about the apartment, and suggested places to see and to eat. When we were leaving he booked a taxi for us and took out luggage down.
The location is wonderful. There is a tram at the doorstep, and another around the corner, that will take you to almost all the place you want to see in Milan. The Metro is about a five minute walk. There are restaurants within a five minute walk.
The only downside was something that was out of Marco's control. The front of the building is being refaced and is covered in scaffolding so we couldn't use the balconies. The work was noisy in the daytime but that's when we went out so it wasn't a big deal.
I'd definitely stay there again.