We would highly recommend staying in Maria's air B+B.
Our flight was delayed by over an hour which resulted in a very late arrival into Milan but Maria still met us outside the apartment at 12.30am! Even at this late hour she took the time to give us advice about where to go eat/places to visit etc.
The apartment was perfect. It is located right outside a metro stop and there are loads of great restaurants and bars on the doorstep.