We had a nice weekend in Berlin, with a group of friends. Arrived on Saturday, left on Tuesday. Roamed through the city, which was no ordeal as the weather was perfect: real early Spring.
I was not able to make elaborate sketches, if you are with a group, you have to adapt. This is a quick impression of one of the terraces at the station "Hackeschen Markt", one of the major S-bahn stations.