I'm in the wrong part of Germany to offer advice on Berlin and surrounds, however I want to chime in and wish you a very pleasant trip. There is no shortage of excellent pipe tobacco blends to be found in Germany. Perhaps you can have some HU blends or others sent to your accommodation.
There is the "fast food" of tobacco shops. Wolsdorff. They will still carry Dunhill tobacco as well as WØ Larsen and others. Most will also offer a modest selection of pipes certainly including Vauen. Wolsdorff can seemingly be found everywhere but will not be as nice as, for example, Pfeifen Huber in Bavaria.
I hope you have a great trip!