Apartment was really nice, clean and comfy. Located in nice area, 10-15 min driving (by taxi) to Tegel airport, and close to the local bus 109 station. If you want to catch U2 metro, there is a station 10min walking from the apartment. Andreas is very nice and welcoming host, responsive and providing the tips for transport and area to visit.
Big recommendation if you want to experience nice stay in Berlin.
P.S. At the building entrance there is really nice bakery, with bio products. A bit pricey but really tasty.