This cabin would be great for a family staying for a few days. (We only had one night.) There is so much to see on Bruny Island! The place is SPOTLESS (like, you could eat off the floor it's so clean) and well-appointed. The kitchen is fully stocked with appliances, cutlery, etc. but make sure to bring all the ingredients you need for cooking including oils, spices, etc.
Near the cabin is a beautiful little beach. It was rocky when we were there so I am not sure it would be the best for swimming, but there are tons of other places to go nearby.
All in all we really enjoyed our short stay and would visit again.