We did spent a week in Michele's flat and it was the best time ever! We were six persons and it didn't felt uncomfortable for a second. The two rooms had separate access to the kitchen and the bathroom.
The flat is situated in a peaceful neighborhood with an easy access to the tram, metro and S ban, that could take you to any part of Berlin for around 20 minutes.
Michele was a great host, the place was really clean and welcoming. He did support us on all the way from the day when we decided to book the place until the day we left. He responded on every email within few hours and helped us a lot to have the best time in Berlin. I do recommend his place!