The appartment was as in the pictures shown, very spacious and modern. I highly recommend it for a max. of 6 grown-ups as the sleeping-couches aren't very comfortable to sleep on. The bus to the airport as well to the city center leaves just around the corner (takes 15 min both ways). There is a bakery next door and many restaurants just 10 min walking distance. I can highly recommend café tirée for delicious breakfast (have also vegan food).
We had a great time in Berlin, Simon was very nice and let us in 1h bevor official check-in.
See you Berlin!