Gluten-Free and Vegetarian are 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.
Guru in Vienna describes itself as a North Indian restaurant and says its set menus and many other dishes are gluten free. The site also says vegetarians will find a suitable dish, but it does not list allergens per dish. Tell the staff about your allergies, the kitchen has the final word.