From Berlin Brandenburg Airport (BER) to the apartment: 

(37 minutes) RE8 → S Ostkreuz, change to S42 → S+U Schönhauser Allee, walk 3 minutes to the apartment

(40 minutes) FEX → S Ostkreuz, change to S42 → S+U Schönhauser Allee, walk 3 minutes to the apartment

(52 minutes) S9 → S Treptower Park, change to S42 → S+U Schönhauser Allee, walk 3 minutes to the apartment

(54 minutes) S9 → S Treptower Park, change to S8 → S+U Schönhauser Allee, walk 3 minutes to the apartment

(56 minutes) S45 → S Schöneweide, change to S85 → S+U Schönhauser Allee, walk 3 minutes to the apartment

From Berlin Central Station to the apartment:

(19 minutes) RE85 → S+U Gesundbrunnen, change to S41 → S+U Schönhauser Allee, walk 3 minutes to the apartment

(22 minutes) Tram 12 → U Eberswalder Straße, change to U2 → S+U Schönhauser Allee, walk 3 minutes to the apartment

(22 minutes) U5 → S+U Alexanderplatz, change to U2 → S+U Schönhauser Allee, walk 3 minutes to the apartment

(23 minutes) Tram 12 → Stargarder Straße, walk 6 minutes to the apartment

(24 minutes) S7 → S+U Friedrichstraße, change to S1 → S+U Gesundbrunnen, change to S41 → S+U Schönhauser Allee, walk 3 minutes to the apartment

From Berlin Central Bus Station (ZOB) to the apartment:

(32 minutes) Walk 12 minutes to S Messe Nord/ZOB, S41 → S+U Schönhauser Allee, walk 3 minutes to the apartment