Diego's place was absolutely perfect for my Milan adventures. I had originally booked a hostel but it was awful for many reasons. I found Diego's place during a disgruntled early morning search and I am glad I did. It was clean, cozy, cool (AC!!), and very private despite being in his apartment. There are doors separating the bedroom and bathroom from his section, but he is readily available if you need any help. He's also super friendly and accommodating to boot. Would definitely stay here again.
It's walkable to many of Milan's best areas, in addition to being near multiple Metro stops.