Really beautiful house in a beautiful location with wonderful, responsive hosts.
We happened to be up on a particularly cold, windy (I assume this is rare!) couple of days in January and had a bit of trouble keeping the room warm, even with the great fireplace, and the tankless water heater struggled a bit to keep the showers warm. I can imagine this is an ideal spot in warmer weather, though -- be sure to take a peek at the weather reports for Waimea (aka Kamuela) to get a sense of what the weather will be like in this more mountainous region of the island. We were definitely a bit surprised.
It's best for romantic couples and perhaps young families. The open master bedroom layout along with the adjacent fireplace leaves no doors/screens between the bedrooom and the bathtub. If you and your friends/family can roll with that, it's great.