Communication before arrival was excellent. Rita provided clear directions and Klaus met us on arrival even though we were late (delayed coach arrival from Poland).
The apartment has everything you need for a comfortable stay. Wifi connection very good. The entrance is secured and the Charlottenburg location is excellent for accessing underground, train and buses to see the many sights in Berlin. Klaus recommended the Welcome Berlin Card which provided us with 72 hours of transport and discounts on tours and museums. Well worth the price. Highly recommend the "Insider- Main Sights Walking Tour"-4 hours.