This was the first time I have checked out breweries while in Frankfurt, Germany. I had the chance the last time I visited in August, 2019 to visit BrauStil which is a microbrewery located just north of Frankfurt center. They have an outside biergarten and there beer was very good. Check out their website for more info and stop in for a 0.5L the next time you are in Frnakfurt. http://braustil.de/