Wrong location on Tripadvisor! It is next to Friedrichstrasse Bahnhof instead of near Alexanderplatz.
Excellent and "cut to the chase" exhibition for Berlin post WW2. Includes life on both East and West Berlin and how difficult it was to cross the border. Covers history all the way to the fall of the Berlin Wall.
For a more comprehensive history go to the Deutsches Historisches Museum as well.