It's great place to stay and great value. You have spacey living area, so staying with 2 couples worked very well. As the apartment overlooks the inner courtyard is nicely quiet. Steglitz and Friedenau are nice areas with plenty options to eat and drink - without having many tourists. And with public transport you can easily reach any place in Berlin.
Ana will make sure that check-in and communication are smooth and easy. The apartment itself was clean and has a modern kitchen and living area.
Definitely a recommendable place to stay in Berlin.