Our first time visit was fully successful. We loved the cool interior design siuated in a birch wood forest. Very quick and friendly staff. Lot of vegetarian and one vegan burger in a fairy tale-styled menu card. We had the lunch offer for EUR 10,80 (one burger, one french fries, one cold and one hot drink) and loved the food. I had the orange/ginger soft drink, which was too much sweet. But the rest was very tasty and the high light was the "grand mothers surprise" as dessert, but one portion was very much fine for two.
If we have the chance to visit "Hans im Glück" (anyhow in Cologne, Essen, Munich or Wuppertal) again, we will do this.