I can only review the restaurant, but it is perfectly suited for people with celiac disease.
When I made the reservation, I indicated that one of my guests had celiac disease. When we arrived and were shown to our table, we were immediately asked who needed to eat gluten-free. They explained everything that was acceptable, including the fact that the deep fryer was gluten-free. Everyone was really knowledgeable, and I (and my companions) enjoyed the food (Kaspressknödelsuppe and Wiener Schnitzel with fries). There was even dessert available, which I could have eaten.
Many thanks to the owners for allowing people with celiac disease to eat outside safely.