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.
A taco bar and tortilleria in Margareten that makes its own corn tortillas and masa from organic Austrian corn. 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.