I can't say enough great things about Marco's place - it was clean, in the perfect location (walkable to every place we wanted to see in Milan), the perfect amount of space for a couple (even up to 3-4 people if you don't mind also using the loft bed) and Marco is a very helpful host! I would highly recommend his place for your stay in Milan.
Also, the bathroom/shower situation is a bit unique, but I think it works very well and we had no complaints about it! It keeps the bathroom extra clean :)