We loved Leonie's house! It's an older home but totally renovated to be modern and the moment you walk in you realize what a nice space it is. We'd absolutely stay again - the hosts were very responsive to our needs.
Our one watch-out is that the house is a bit drafty, so if it's windy and cold in Barossa bring some warm clothes to lounge around the house in. The heating helped a lot, but if you're in the kitchen next to the windows a lot it's hard to escape!