Map: https://goo.gl/maps/cJWNAyaXjf4knDscA
By car: follow this Google Map route from Bad Hombruger Kreuz / A661 to Hausen-Arnsbach train station.
https://goo.gl/maps/Gmfv4ozZVQDbbL9h7
By train:
There is a stop of Taunusbahn in Hausen-Arnsbach, running from Bad Homburg towards Grävenwiesbach or Waldsolms-Brandoberndorf at least hourly.
From Frankfurt (Main) Hauptbahnhof S5 direction Friedrichsdorf to Bad Homburg v.d.H Bahnhof, then change to R15 towards Waldsolms-Brandoberndorf, get down at Hausen -Arnsbach Bahnhof.
Look at www.rmv.de for actual times.