MORIZ in Vienna describes itself as a 100% vegan Zuckerbäckerei and Manufaktur with cakes, tarts and pastries made in house, using certified organic ingredients wherever available. The site says some products are made without gluten, soy or nuts, but also that flour is in the air in its bakery and asks people with coeliac disease to take care. Tell the staff about your allergies, the kitchen has the final word.