After staying with Jay for two weeks our family (4) referred to him as Santa: you don't ever see him but there are always new presents on the porch: baked goods, fruits, vegetables, etc. That doesn't mean that Jay is hard to reach; to the contrary, he is responding quickly to anything you need but tries to stay out of your way as much as possible.
The guesthouse is exactly how described, and there was enough space for our family of four. We found a new air mattress that allowed the kids to have their separate beds.
The location of the place works really well if you want to visit the southern beaches (Honomalino, Ho'okena, and Honaunau), the Green Sand Beach near South Point, and Volcano N.P. If you prefer the beaches north of Kona it's a drive. Supermarkets to the south are 15min away and carry everything you need - including the best and cheapest Ahi you will find anywhere on the island.