After following the directions provided by the local, you'll eventually reach a large intersection. Make a left turn at the Litfasst column. On your right, you should see an old church; proceed across the market square. Immediately behind this is where you'll find the grocery store. The exact location of something next to the grocery store is not mentioned in the directions; hence, I can't determine what's next to it. If you could provide more details or give me updated directions, I could try to find that information for you. For now, the main result is that you'll find the supermarket directly behind the old church, after crossing the market square.