Ate here a couple of times on a working trip. The service is friendly but can be a bit slow sometimes. I recommend you taste Knoblauchgarnelen for starter and Flammkuchen Der Gruene for main course if you do not want to eat too heavily.
Knoblauchgarnelen has spicy shrimps with aioli and brean - very good. Der Gruene is a pizza-like plate that has a thin crunshy bottom and ham, cheese and salad topping.
With two pints of weissbeer the meal was just 20€.