Marco has a very cute apartment in the north Milan. Its well-connected and can be reached easily by Tram or bus. I stayed with Marco for 5 days and even worked from there remotely for 3 days. The Internet connection was great and I had no issues.
What I liked most about the apartment is you get to use entire bottom space for yourself and you have your own bathroom which I think a big plus. The apartment is a bit open-space, so you can hear if there someone the kitchen upstairs, but that didn't really bother me.
Unfortunately, Marco was very busy with work when I was there, so we only chatted briefly. But you can tell he's very easy-going and an open-minded person who is easy to get along with. He is also very generous and even provides coffee, tea and some, let's call them "Italian breakfast items" (I.e. biscuits, rusks)! Truly a sign of an amazing, accomodating host.
The area itself is more a residential area, I was there in August and unfortunately found most of the shops closed for the summer. So if you wanted some restaurants or cafés/bars to hang out, you had to go to the city centre or the southern part of town. For me, it wasn't a big problem and I'd rather stay in a quiet part of town. The Tram runs to pretty late there are night buses.