I stayed at a holiday villa complex in Daylesford a couple of years ago which was really nice. We were there for a wedding.

If it were me, I'd definitely go back to the Great Ocean Road. We were on a road trip and stayed at a few places but that road and the views are amazing! We had started from the Adelaide end and did the Barossa Valley before heading down to the GOR. I guess it depends on how much time you have and whether you want a traveling holiday or to have a single base.