Berlin is not New York but you can easily perform some night shooting with a lot of details, colours, crowded roads and traffic lights. Just consider that this kind of pictures looks more interesting if you can reach a different point of view on the situation. Usually shooting from an elevated structure makes the job. I took this Friedrichstrasse picture from the platform of the homonymous station. It offers a good elevation, a nice sight of the street below and also a roof so you can shoot even if it rains. If you walk toward the other end of the platform you will have a wonderful view of the river Sprea and the Reichstag with is illuminated dome.
Don’t forget your tripod.