First things first, this place is great as long as you know what you are getting into. You will need a vehicle with ground clearance to get there and it is about 20 miles north of Hilo. We had a Jeep and found a great little grocery and deli at the bottom of the mountain where the locals had gathered to listen to live music so it was perfect for us.
The views are amazing from the top of the hill. We rented the main house, but there is at least one other rental on site and it looks like another is being built. The main bedroom is straight up the hill from one of the waterfalls you see in the pictures. With the cool breeze and the quiet rumble of the falls, my wife and I had knew if the best night's sleep in a long time.
Unfortunately, we arrived a day or two after some heavy rain. The hiking trails were passable, but very muddy and slippery. The water was a little too cold for my wife which limits how far upstream you can go.
We would definitely come back here with our kids. It would be great for them to simply roam the property.