We stayed one night at KMEC to avoid a long drive after a night bike to the 61g lava flow. It's a rustic retreat with screen cabins and bathrooms overlooking rainforest. It's very well maintained, clean, and volunteers working there are responsive and friendly. We enjoyed fresh fruits from their many tropical trees.
Perhaps one warning about such an open air facility in the forrest is that the frogs, or croakies, are incredibly loud and made getting to sleep a little tricky. They're all over the island, but a hotel or home with full walls and insulation would indeed insulate from this annoyance.