GPS took us there,we drove to the top at night, single lane carriageways, extremely easy to miss a turn by just feet, a difficult entrance. Next day, using GPS, no problem exiting, via a different route, it could be done w/o GPS. Office, at night time NEEDS a PROMINENT sign "Office Schlosshotel Kirchberg", because you are in a town square, & have no idea of where "check-in" is. It is an impressive building, well updated & maintained, IT HAS AN ELEVATOR !
The night Manager, from Croatia, was EXTREMELY HELPFUL !