I had a great stay with S. Her place is very close to Tegel airport and she gave me great directions. The apartment is the top floor, has a balcony with a great view. It's small but really that is all you need when traveling for a couple of days. The room had a little bit of candy and a coffee machine that I used quite a bit. I arrived hungry and she even came with suggestions of where to eat.
My only small complaint is that there is a smell of cigarette smoke. I aired out my room so it was not a problem for me but someone who is more sensitive might not like it. I would stay here again regardless.