Stayed in the apartment with 4 people for a university visit to Polimi at Bovisa, the apartment was clean, well maintained, and in a pretty nice location (both for getting food/groceries and for public transport connections).
It was 35 degrees and the apartment does not have AC, however there are fans in all the rooms and we managed to survive!
One thing to consider is that there is one bathroom with both the shower and toilet of the apartment, so there might need to be some coordination if you're there with a lot of people.
Overall, a very good apartment like experience in Milan!