Take the A7 exit to Rothenburg ob der Tauber:
Then drive from Rothenburg towards Bad Mergentheim/Romantische Straße until you reach Schonach (about 9 km). When driving into the Taubertal valley, take a left towards Niederstetten. Just before reaching Schwarzenbronn, take aright towards Archshofen. Follow the road through Weiler and Wolfsbruch until you reach Schonach.