Other reviews are correct, this place is perfect for kids.
Our 2 year old would never if leave if it was up to him: Baskets of toys from Marcos and Wendy's grown son ("where are new cars?" was uttered approximately 600 times on the way home), three "Hair" sheep pick at grass in the yard, the natural noises of the area cascade through the walls, chickens, cats, and Lulu the delightful dog who visits daily and a beautiful lanai that looks over it all.
The place is completely practical (perfect for us, parents), washer/dryer, full kitchen, Wendy and Marcos brought us honey from their apiary, and a variety of fresh fruit.
The more hippie-ish west side of the big island is vastly different from Kona and the east side, which is similar to the other islands. And because it's not just beaches and Mai Tais, Marcos, who works at the Volcano, and Wendy, our gracious host, were able to point us in all the right directions. The Volcano was spitting when we went which was amazing at night. We were interested in going to one of the warm water pool areas and Marcos directed us away because of a bacteria concern, thank you Marcos. The snorkeling at the Kapaho tide pools, we found to be the best on the island. It takes some doing to find great spots, but it's unreal: the coral, the fish, I could go every day... Also many of the beach spots are accessible through gated communities and subdivisions and the Kapaho community was very friendly. The other must-do only happens on Wednesdays and is the festival/farmer's market down on the point, it's provides a wonderful lens through which to view the side of the island.
Wendy, Marcos, their son and Lulu, were graceful hosts and fantastic guides to this more unique Hawaiian experience! Mahalo!