From Vienna via car:
Take the A1/S33 and follow this road until Krems. Then continue onto B3 until Spitz. Take the exit to Spitz and continue onto B217 directed to Ottenschlag. At the next roundabout take the exit onto Kirchschlag and continue to Roggenreith.
From Melk/ Linz via car:
Take the A1 directed to Emmersdorf, continue onto B3 directed to Marbach and Weitenegg, however, turn at a roundabout directed to Pöggstall and continue onto B216 and follow this road until you can turn to B36 directed to Ottenschlag. There you will be able to turn at Roggenreith, which means you’re almost there.