The space is very beautiful, large and comfortable. As other guests have reported, it is quite isolated... but that's the beauty of it: at night you hear nothing but the sounds of nature.
The road to access it does indeed include stretches of unpaved terrain that can become quite treacherous after heavy rains; it is not *that* bad, as long as you drive slowly and have an appropriate vehicle. Consider you'll need 40-60 minutes to get to central Hilo, and 20-30 minutes to get to the Volcanoes National Park. It is a very strategic location for exploring the Southern coast of the island, and very much recommended to anyone who desires a quiet place with a jungle feeling to it.
The hosts were very responsive when we had issues or requests.