It was the fantastic accommodation!
Berlina is the most hospitable host that I 've ever met. There was all necessary for comfortable staying in Berlin: towels, bedding, table for work and wi-fi, and even umbrella :) The apartments are very clean and pretty!
So, you can stay here with little children also. There is baby bed and seat, little plastic spoons, cups and plates.
Also apartments are located near by tram stop (about 10-15 minits to the city center) and S-Bahn station (ring train and lines to the airport Berlin-Schönefeld).
Thanks, Berlina! It was nice 3 days in Berlin!