My wife and I will be arriving in Frankfurt in a few weeks early morning for a layover between 6:25am and 13:35. Our plan is to take the train into town and walk around until Klein Markt Halle opens up at 8am for breakfast. Are there any places nearby open early enough that serve we can try apfelwein while we are in town? Will there be vendor stalls inside Klein Markt Halle that serve apfelwein? Since we are flying out at 13:35 to Athens, I'm assuming we should head back to the airport no later than 11:30am.