Not sure how far outside of Cincinnati your friend wants to go, but the courses I would recommend are:
Stonlick Hills (Batavia, OH)
Indian Ridge GC (Oxford, OH good course on a rolling piece of property - but lots of turf problems recently)
Buck Point GC (Liberty, IN) is a blast to play, quite hilly and worth the trip
Grand Victoria (Rising Sun, IN) Tim Liddy casino course that is quite good
As for Aston Oaks GC, if your friend likes lots and lots of houses then play Aston Oaks, otherwise there are much, much better courses to be played. Aston Oaks was done by Nicklaus group and not Nicklaus himseld - not that that matters.