I stayed in Berlin this summer and I had great difficulty eating GF. I also have Celiac's and I can speak a little German, but most servers were not educated in ingredients the way I expect American servers to be. I frequented Doner Kebab stands sometimes but witnessed a lot of cross-contamination, and really shouldn't have been doing that. Grocery stores have far more GF options than American ones, but my greatest recommendation would be to frequent Indian and Thai restaurants.