By public transportation:
From the Airport Tegel take the bus no. X9 to Alexanderplatz and change onto the U5 to Samariterstrasse.
From the Airport Schonefeld take the S-Bahn S9 to Ostkreuz and change onto the S42 to Frankfurter Allee.
From Ostbahnhof take the S3 to Ostkreuz and further the S42 to Frankfurter Allee.