We stayed 5 nights and it was just enough to enjoy KI and the wonderful property. Some things that first-timer visitors to KI (such as I) might be interested to know:
1. As with many houses on KI, the house uses rainwater stored in a water tank right next to the house. No issues with water quality. On our first night, the water in all the taps stopped running, and everyone had an "oh-oh" moment. Luckily, one of our group was a facilities manager, so he popped out to the water tank and literally flipped the pump switch leading out from the water tank "on-off-on" to reset the pump. Water started flowing again. It seemed the pump had tripped and so a simple reset solved the problem.
2. Driving down to the Kangaroo Beach was really lovely - we had a Mitsubishi Outlander that had 4WD, so it wasn't an issue. Just make sure to watch out for a small metal gate right next to the 3 houses that form Kangaroo Beach Lodges - the sign is pretty small so you might miss it if you weren't paying attention. Remember to close the gate behind you after driving through. We parked our car on the grass just at the foot of the hill, but did not drive onto the sand as we were worried about getting stuck on soft sand. Additional bonus for our kids - there was a rusty old tractor at the foot of the slope, that the kids loved climbing onto and "driving".
3. We were there in the winter, so the nights did get quite chilly, but it wasn't really an issue. The fireplace and the air-conditioning unit in the main living area was sufficient to heat up the big living/dining area, but the rooms did not have separate heaters. This wasn't an issue for us as the blankets / comforters were really warm. Do note that we had 2 young children with us (a 2yr old and a 5 yr old) who had never seen a fireplace before (we're from a tropical country!), and the 2 yr old did singe his fingers very briefly touching the fireplace. Lots of tear but no permanent damage, but do make sure to teach and monitor young children in your group to avoid burns.
4. Lastly, do remember to pop out to check the stars at night! It was cloudy most of the nights we were there, but on 1 of the nights we did manage to get a clear sky, and the stars were amazing - the whole sky was lit up!