Frank's apartment was wonderful! It could not be in a more convenient location- within walking distance from literally everything. There are restaurants, shopping, public trains, buses, museums, grocery store, and sites within 2min to 10 min walk. The place is cosy but very clean and neat- perfect space for 2 people. The wifi works well and is free. There is a great view of the TV tower, and the window offer lots of light and air. Frank was super accommodating and helpful- let us drop off our bags earlier than the normal check in time and gave us a map and lots of recommendations. I will be staying here again next time I am in Berlin for sure!