This is my favourite restaurant in Cologne! You get very delicious and spicy meals, cooked with love. The place is nice, quiet and meditative, the stuff is very friendly. Some ingredients are organic, and you can have all meals in vegan options. And no: It is not expensive (around 10€ for a complete menue with 3 courses!), you can stay there as long as you like of course - so don't hesitate to go there.