Have a look at the map to find the Freie Universität Berlin.
Transport from Tegel Airport
From Tegel airport, take the X9 bus outside the terminal in the direction of S+U Zoologischer Garten. Exit at stop “U Jakob-Kaiser Platz” and board the subway line U7 in the direction of Rudow. Exit at the stop “Fehrbelliner Platz” and change to the U3 in the direction Krumme Lanke. Get off at U Thielplatz. Travel time is around 30 minutes.
Transport from Schönefeld Airport
From Schönefeld airport, take the SXF1 bus outside the terminal in the direction of Südkreuz Bnf. Exit at Südkreuz Bnf and change to the S41 Ringbahn towards Heidelberger Platz (this train goes clockwise around the ring). Exit at Heidelberger Platz and change to the U3 in the direction of Krumme Lanke. Get off at U Thielplatz. Travel time is around 50 minutes.