We had such a great stay in Berlin, 3 full days.... it was a bit rainy but we made the most of the trip.
We walked everywhere so we could explore.
We used all of the trip planner that Alan & Kasia had provided, easy directions to follow from the airport to the apartment, the very detailed and fun descriptions of all the things to see and visit was spot in.
The restaurant recommendations were also amazing. The very local Bavarian eatery and Umami Indochinese were the two best ones.
We would definitely recommend your apartment and recommend Berlin to family and friends, no one should miss the experience.