Health Kitchen is a great place to get healthy and tasty food in Vienna. When I went there last week I was especially delighted that they don't only have the "typical healthy food" (aka Quinoa and Avocado sth), but rather a mixture of different cuisines.
What I especially love and appreciate about the menu, is that you can get different dishes like the poké bowl, La'mien or pho with different meat, fish or tofu selections. That way you can easily customize your dish. It also broadens your choices as a vegetarian or vegan, as you can often even take tofu instead of the meat and are therefore able to get almost every meal they have.