Vegetasia - I recently rediscovered this great little Taiwanese vegetarian/vegan restaurant. Not only is it a glutton's paradise, tempting with an all-you-can-eat lunch buffet for 6.80€, but the place is sleek and stylish. Other pros include: it is non-smoking, they use no MSG and the staff is super friendly.
Not surprisingly, it's popular for lunch and reserving ahead is not a bad idea. The food is delicious and well presented. In addition to a variety of vegetable dishes, they also serve tofu and soy-based fake meat. The buffet offers such a great selection of starters, soups, salads, noodle, rice and vegetarian dishes, as well as desserts that I never know where to start - or stop for that matter.
Vegetasia definitely offers one of the best values for vegetarians in the city.
Ungargasse 57, 1030 Vienna, 01 713 8 33 2
Kaiserstrasse 45, 1070 Vienna, 01 523 10 91