On Sunday evenings a menu is served at 19.00 o'clock for only a few euro. It's nothing fancy, just a decent meal. They serve vegetarian as well as vegan food, if possible made with biodynamic ingredients.
It's located in a national monument, and a formal squat house. The restaurant stems also from that time, and is still part of a social community building. It has a very friendly and welcoming atmosphere. If you're interested in animal rights, social movements etc, you're on the right spot.