We loved staying here! Joe was friendly and helpful, and gave us a good rundown of how the cabin works.
Off the grid is very different - be prepared to not have some creature comforts. If you want to take a long, hot shower or stream movies, this may not be the place for you. Depending on the time of year, be prepared for rain. It can come and go suddenly, but the warm weather makes this more comfortable. Also, the mosquitoes can be quite irritating. The cabin is completely screened-in, so we never had issues indoors.
That being said, this place is beautiful. We were already impressed by the nighttime drive there, and were awed during the day. The area is thick jungle, with wild chickens, colorful birds, geckos, and coquis. The shoreline is within walking distance, with cerulean waves crashing on black lava rock against a verdant jungle. The property itself has a variety of plants, bananas, cocoa, lemons, etc. It's only a few miles outside the town of Pahoa, which has some fantastic restaurants and a great supermarket. Also a few miles away is Fissure 8 and some amazing views of impressive (cold) lava flows. I loved the lava in this area more than Volcanoes National Park!
Overall, we would definitely stay here again. In a way, it's a lot like very fancy camping. There were a lot of pros and cons, but the pros far outweighed the cons.