Gluten-Free is on the menu, but the same kitchen also prepares what you avoid, so cross-contamination is possible. Tell staff what you react to, and ask how your dish is prepared before you order.
The second branch of the Maíz taco bar, in Josefstadt, with the same house corn tortillas and daily changing fillings. The site says the kitchen is gluten free, but its own dish list marks two fillings and the beer with allergen A (gluten), so ask which fillings are on that day.