Elena's place is big. There were only 4 of us but the apartment was really big and had more than enough space. There are 2 floors, but the upstairs is where the washing machine is and more of a walkway. In one of the rooms, there's an extra bed on that floor.
My only complaint about the apartment is that the windows run along a VERY busy road in downtown Milan. On a weekend night, it can get very nosy so be prepared for that.
Great restaurants and shopping within a 5 minute radius. The Duomo and train stop is only a 5 mins walk from the place