Jennifer is the best. She waited for us with a basket of fruits, chocolates and water and then explained everything and recommended us a few places.
The apartment is very well equipped and it includes a washer and dryer which is fabulous when you are traveling.
Also the place is very well located, only 3, 4 mins walk to the subway and from there you can move all around Berlin.
Would definitely stay there again on my next visit to Berlin.