I stayed at Jennifer's apartment for 2 nights with some friends. It is very well located in the western part of Berlin and has the metro station Adenauer Platz right around the corner. The bus 109 to airport Tegel is also just there and circulates every 10 minutes, taking only 20 minutes to the airport.
Jennifer and her father pampered us with fruits and chocolates, and also gave us a city guide. It is these little things and of course the beautiful apartment that made our stay very pleasant. I can recommend it without any hesitation. Thank you very much for being such a nice host!