I wanted to eat there with my boyfriend because I have a gluten intolerance and I read about the gluten-free burgers online.
When we sat down at a table where there was neither a reserved sign nor anyone saying anything to us as we walked through almost the entire restaurant, a very rude waitress came to us and asked if we had reserved and pointed this out to us with a very annoyed undertone Next time I'll have to wait at the reception (which wasn't visible either).
We then felt very uncomfortable and I didn't want to eat there anymore because I also had a bad feeling because of the gluten-free as there was no indication anywhere that it was gluten-free except on the rolls, the service didn't really speak German well either.. .we left straight away. A pity!