The burger is delicious - I think it's the best I've had so far in Vienna, and I'm always on the lookout for a good burger here. They bake their own buns and stuff a generous slice of cheddar between two patties made from high...quality beef (no gristle, ground just right).
It's small, so you should probably phone in a reservation, although they will open up a good-sized Schanigarten (outdoor seating on the sidewalk) in May.
The owners are two super nice brothers - one is the manager, the other is the executive chef. You can tell that they care about the quality of the food and the experience of the guests.
In addition to the burger (which I've eaten on three separate occasions), I've also tried one dessert (don't recall which - it was a special, I believe), and it was delicious, as well.
There's a large, fully transparent window into the kitchen, so you can watch as the cooks prepare your meals. I like the ambience and the interior decorations, as well, and the personnel have always been super friendly.
In addition to the food, they also have a nice selection of beer (including IPAs in the bottle and Tegenseer on tap), wine and spirits. Have a look at the alcohol behind the bar - most of it is top shelf and / or boutique stuff - again, showing the owners' dedication to using quality ingredients. Ask Patrick to make you a Negroni - delicious!
I can only say good things about Der Fuchs und die Trauben (The Fox and the Grapes, one of Aesop's fables). The food, the drinks, the atmosphere and the personnel are all top notch.More