Truly a unique experience! I really enjoyed staying at the Lava temple. My wife and I stayed here for 2 nights while exploring Volcanos NP and the southeast side of the island. There’s ample space in the Lava Temple to spread out and the open air environment is very relaxing.
Note that as described in the listing, the Lava Temple is not a hotel room and is more like “glamping”. While there’s electricity, hot water, etc, this house is off the grid, meaning that these may not always be available (we ran out of power one morning and cooked breakfast with headlamps). There’s also lots of sounds during the night, from the sound of the frogs to palm trees rustling with the wind.
However, I would absolutely recommend the Lava Temple!