My elderly mother and I stayed at Sean's place for two nights, with mixed results. The place is fascinating and beautiful and very lovingly tended to. Being off the grid though, I would maybe recommend that you keep in mind that you may not find the place ideal after a long day of travel or sightseeing. We arrived our first night to find the solar batteries almost depleted, meaning that we had to get situated with the loud, incessant beeping of the low-power alarm blaring beside us. When we wanted to just sit and relax after a long day, instead we had to sit in the dark because the batteries died. This is obviously not Sean's fault (he can't control the weather) but just know that this is a possibility when you arrive. As for sleeping, both buildings can be warm and stuffy, so if you're a cold sleeper (like me and my mom), you may have some trouble. If it rains frequently during the night, you'll probably sleep great though.
Also, it's worth mentioning that there is currently no visible lava from the house or anywhere on the island at this time, so keep that in mind if that was one of your draws to this property (it was for me and was kind of a bummer).
For young folks looking for an adventure and a story, this place is fantastic and I would highly recommend it. But if you're older, have balance issues or are looking for a comfortable no-nonsense place to unwind after a long tiring day, you might be better suited elsewhere.