From Vienna via A2 to Friedberg exit and B54 to Rohrbach, continue via Mönichwald to St. Jakob im Walde.
From Graz via A2 to Rohrbach - Vorau exit, then to Rohrbach and on to Waldbach and St. Jakob im Walde
From the S6 exit Krieglach via the Alpl to Ratten and St. Jakob im Walde
Detailed information on how to get here can be found here.