Recently went to Bieberbau with our two sons at the recommendation of our hotel (we asked for good, modern German food, in an authentic spot). Although a bit out of the way, Bieberbau is definitely worth the trip. The restaurant is run by a husband and wife team and the menu is a very creative, modern take on German cuisine. There are 3-, 4- and 5- course menus -- all extremely reasonably priced given the quality. We opted for the 3 course and, taking into account the amuse-bouches, suprise offerings and cookies from the kitchen, was more than enough for us. An excellent, German/Austria focused wine list. The restaurant is in a stucco showroom from circa 1900, which is worth the visit alone.