Great flat, very spacious, comfortable, bright, well equipped, and extremely quiet, in a great neighbourhood. Alexander was always available whenever I needed anything.
Several U-Bahn (underground) and S-Bahn (overground) trains within 7-12 min walking distance each, as well as direct trains from and to the airport running from Charlottenburg station every 30min/1hr too (10-11min walk).
Dozens of good restaurants, coffee shops, and bakeries around, as well as a great Saturday market (Karl-August Platz), and a myriad of local boutiques.