We had our wedding lunch at the Ratskeller. The service was terrible- they took about an hour to start serving lunch. There was also a lot of confusion about the gluten-free and lactose-free meals we requested. Finally, the day was almost ruined when the server brought out a cake that was not gluten-free (after we checked with the management to verify that everything on the menu would be gluten-free because of my allergy). I took two bites, which made me feel sick. Thankfully, I took a Benadryl which made me feel better. Otherwise my wedding day would have been ruined. I was told that the Ratskeller was the best restaurant in Aachen, but I can say otherwise now. I would advise anyone to choose another restaurant than the Ratskeller for a wedding lunch or other special event.