Minh Khiem actually stands for authentic Vietnamese food and excellent service. Their menu might be tagged as: extensive (80 dishes on the menu!), Vietnamese or also vegetarian, in any case it deserves the tag #delicious! :).
Be aware, this is not fast but good food! In case you want the opposite, I suggest you look elsewhere.
They also do delivery in the surrounding districts, which might be an option for you if you expect a fancy or even very nice ambience, since you won’t really find that at Minh Khiem. The decoration in the small restaurant is nice, the room itself not so much. Well, they tried!
What really counts is the food which I can totally recommend, and also the service. You rarely (especially in Vienna) find a waiter as attentive as Mr. Khiem. He sees a customer taking out a pill and comes over to offer him a glass of water for it, or when seeing some other customers having a cold and using up all the napkins on the table, he still offers them some more when they are leaving the restaurant. Simply nice :), you will feel taken care of here!