Hammelbach is about 50 minutes drive from Frankfurt. Well, of course this measurement only applies if you don’t get lost. As I told before, it doesn’t exist in the map so the destination should be directed to some kind of sub-district where this village is included under its administration. (In Indonesia, if Hammelbach is a desa then what exist in the map is the kelurahan).
I went there with a car so I have no idea how to get there with public transportation. And even with a car, me and my friend were lost and have to call our host to pick us up. We have to do it because it was already night and we even had a wrong turn and end up in a cow bar! (Actually, most of the road signs here are picture of cow crossing the street!)