I arrived at a late hour of the night, and was welcomed by a friend of Daniel and Ben. He explained me a little bit about the environment of the flat, and gave me general instructions regarding the property.
At the next day I was glad to discover that a metro station (u-Bahnhof) was 2 minutes walking from the apartment, and s-bahnhof was 5 minutes walking from there. A supermarket, drugstore and many shops and three shopping malls are in a few minutes walking distance as well.
The apartment is fully equipped and beautifully furnished (washing machine, dishwasher, hair dryer, wifi, stove, oven and even a grand piano!). It takes about 15 minuted to get to Ku'damm and KDW by metro, and around 25 minutes or less to Alexanderplatz. Howeve it takes longer to get to the eastern neighborhoods and to the big nightlife centers.
The two weeksstay was very pleasant for me, I'm glad I chose this apartment.