From the beginning till the end we felt very at home. The apartment is very nice and clean. Both the bed and bedsofa are very good.
Bonus is the mini kitchen with cooking facilities and refrigerator. (Although there are plenty nice restaurants in the neighbourhood.)
Francesco gave us lots of usefull tips and was always available for answering questions.
The apartment is in a quit neighbourhood not far from the center with the U-bahn. Next time we go to Berlin, we will definitely book this apartment again!