Unfortunately, the majority of Berlin related images from April 1945 are miscaptioned, staged or just post war.... but here are some picks. Mostly well known pictures, but at least they are from the Berlin centre, timeline being April to early May:
Kolonnenstraße (28 April 1945)
Potsdamer Bahnhof
Moltke Bridge (early May)
Voßstraße, Neue Reichskanzlei