Konstantin is, simply put, a culinary genius. There was not one small wrong thing at his place when i visited. The flavors were tuned like the best orchestral performance ever of your favorite composition. It was no doubt one of my top 5 food experiences ever in my life. (I am italian, a food lover, and been at a few extremely highly rated restaurants). Service and staff were professional, helpful , but nice, relaxed and friendly, never intrusive. Interiors are elegant, modern but simple and not showing off. Very pleasant.
The food was simply sublime and unforgettable. Price extremely fair for the quality. Bravo Konstantin, you'll be (or you are already ?) one of the famous new creative cooks in Europe, I bet on that.
If you are a food lover and travel to Vienna you don't want to miss this, it 'll give you a boost of happiness.