From Berlin Brandenburg Airport (BER) to the apartment: 

(37 minutes) RE8 → S Ostkreuz, change to S42 → S Prenzlauer Allee, walk 5 minutes to the apartment

(52 minutes) S9  → S Treptower Park, change to S42 → S Prenzlauer Allee, walk 5 minutes to the apartment

(57 minutes) S45  → S Schöneweide, change to S85 → S Prenzlauer Allee, walk 5 minutes to the apartment

From Berlin Central Station to the apartment:

(23 minutes) Tram 12 → Stargarder Straße, walk 7 minutes to the apartment

(25 minutes) M10 → Husemannstraße, walk 9 minutes to the apartment

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

(36 minutes) walk 12 minutes to S Messe Nord/ZOB, S41 → S Prenzlauer Allee, walk 5 minutes to the apartment