It was a great time in Rainer's place. The apartment is big, quiet and confortable. We were 4 and stayed together 12 days.
Rainer, host us lovely, beds done with towel, linen, and chocolats. He introduce us the apartment and the city and gave us a map.
The location is very good, near trains station (U2 and U4), markets, cafes and restaurants. You can do manythings by foot in 5 minutes.
When I will return to Berlin, I will contact Rainer to stay in his place again.