It's larger than you'd thing, and very "Old Vienna" inside. The menu is small and focused: Wiener Kuche. However, I've found that the food here far surpasses most other Viennese Cuisine places that I have tried.
The Tafelspitz here was the best I've had. It was perfectly spiced and cooked, and served with the most delicious potatoes and creamed spinache as well as two sauces. The Wienerschnitzel looked great (I didn't try it) and comes with a special glass duck for squeezing the lemon (You have to see it to believe it)