We stayed here on our tour of the big island. We only stayed a night but wish we had booked more time.
The cabin is great — quiet except for the night sounds from the forest. The fridge was stocked with a few items that we definitely made use of (coffee, cream, and yogurt).
The location is amazing. Not too far from town but out enough that you feel like you are the only ones around. We ate at Ohelo Cafe in Volcano (highly recommend) only a few miles away.
Next time through Volcano we will definitely look to see if the Eco Cabin is available!