From Berlin Brandenburg Airport (BER) to the apartment: 

(46 minutes) RE8 → S+U Ostkreuz, change to S42 → S+U Schönhauser Allee, walk 12 minutes to the apartment

(54 minutes) FEX → S+U Gesundbrunnen, change to S41 → S+U Schönhauser Allee, walk 12 minutes to the apartment

(61 minutes) S9 → S Treptower Park, change to S42 → S+U Schönhauser Allee, walk 12 minutes to the apartment

(65 minutes) S45 → S Schöneweide, change to S85 → S+U Schönhauser Allee, walk 12 minutes to the apartment

From Berlin Central Station to the apartment:

(27 minutes) RE5 → S+U Gesundbrunnen, change to S41 → S+U Schönhauser Allee, walk 12 minutes to the apartment

(32 minutes) M10 → Friedrich-Ludwig-Jahn-Sportpark, walk 17 minutes to the apartment

(33 minutes) M10 → U Eberswalder Straße, change to M1/U2 → S+U Schönhauser Allee, walk 12 minutes to the apartment

(33 minutes) S5 → S+U Alexanderplatz, change to U2 → S+U Schönhauser Allee, walk 12 minutes to the apartment

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

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