My friends and I stayed at Marcello's flat for 3 nights, the situation is quite convincing, very close to the metro station and one of the public transport node of Milan. about 20 min walk to the Duomo and all of that crazy things at the down town. The area is a charming nice neighbourhood with enough bars and restaurants to have a great night out. The flat is clean and cozy, enough space for us as four people, a charming building also. You got a well equipped kitchen if you are into cooking, and a small washing machine which could be quite handy sometimes.
I didn't have a chance to meet Marcello in person, but we communicate through phone and it went just well. I would definitely recommend his flat if you are looking for a place to stay close to public transport and also experience and explore one of the most interesting neighbourhood in Milan.