I booked the Heavenly Retreat house for a weekend for a surprise birthday present. My partner and I had a fantastic time. The location is great - not right in the heart of Halls Gap, so quieter and more secluded, but within walking distance of the Halls Gap shops and the nearby visitor centres. The deck has stunning views of the trees and mountains, as well as providing a venue for entertaining birdlife!
The house inside is lovely - very comfortable king size bed, fantastic spa bath, great fire with already cut fire wood, great kitchen to cook up some great meals, fantastic light coming through the house, very clean and well looked after, clean towels, etc. The location is great for nearby day hikes and not far from the main highways if you're coming from Melbourne/Geelong.
I'd definitely recommend coming here or booking it for friends.