My wife, my son and myself stayed at Barbara's boathouse for a long weekend and had the best time. It was exactly what we we're after a quiet remote getaway close to Sydney.
Barbara has decked the place out with everything we could think of. We had dinner at the cute bowling club (a short stroll away) a few little boat trips to Brooklyn (the mainland) for lunch but mainly just enjoyed the peace in our cabin and on the dock (we even caught a fish).
My one recommendation is make sure you book the water taxi that drops you to the private dock if you have a lot of luggage because it's 137 stairs down from the road. Other than that sit back and enjoy serenity.