Unfortunately, they were completely inflexible when it came to special requests. The turkey schnitzel could only be ordered with fries and not with salad, although I would have accepted a surcharge if that could have been swapped. So the fries stayed on the plate and had to be thrown away.
My husband's water glass was completely dirty, making the drink in it undrinkable. When we pointed this out to the server, all we got was an "Aha!" glass, leave the glass. The bill was charged in full for all items. When we asked if there would be any further action regarding the dirty glass, we received an unfriendly "Nope." We paid in full and were left speechless at our table. After a few minutes, the server came and gave us cash for the water. That's what the manager would have said.
Unfortunately, gluten-free in this restaurant just means that everything is served plain. Oh well, at least they offered it... Conclusion: we won't be back.