From Tegel Airport take the Bus TXL towards Alexanderplatz. Change at Berlin Main Train Station and take the S5 towards Strausberg or the S75 towards Wartenberg. Exit at the Warschauer Straße station.
From Schönefeld Airport enter Flughafen Berlin-Schönefeld train station and take S9 towards Pankow. Exit at the Ostkreuz train station and transfer to S5 towards Westkreuz. Exit at Warschauer Straße. Trains leave every 20 minutes and cost 2,80€ per person.