I found out this restaurant during lunch time. There are few tables but it is defenitely a perfect place for vegetarians as it offers soups, desserts, and salads. Water was for free when I was there in May 2016. I tried the soup with spinach and potatoes: it was so delicious that I decided to come back there also for dinner and the prices are convenient if compared to other restaurants in the town center. I would absolutely recommend it for a healthy meal in Vienna!