The Embassy is near the U Bahn Wittenbergplatz on the U1, U2 and U3 lines. When you get out from the U Bahn, please take either the Ansbacher or the Bayreuther Strasse (in the direction opposite to KaDeWe).
They both lead to the Kurfuerstenstrasse which is two/three minutes away down the road.

You will notice four flags hanging at 45 degrees from a building on 84 Kurfuerstenstrasse (slightly to your right, if you are coming from Ansbacher Strasse, slightly to your left, if coming from Bayreuther Strasse).
These are the Liberian, Colombian, Lesotho and Mauritian flags. The Embassy is on the second floor.

You can also take the bus line 100 from the Zoo station and stop at "Bayreuther Strasse".

Here is our location (Map of Berlin)