Rita was extremely friendly and forthcoming. She had left us the tel nr of a bike rental nearby, which was really helpful.

The apartment is in a great location, simple but nicely decorated and very light and airy. Though it was a very hot WE (>30 C), the apartment didn't heat up as there are windows on 2 sides. We could park our car all weekend on a public parking lot just around the corner for 1 EUR per night (!). Around that same corner is the Charlottenburg castle and park, which are both great sites. Nice restaurants and buildings just 1 block away.
As everywhere in Berlin, public transport is really close and well organised. Charlottenburg is a nice mix between city-like and enough green to relax.