Rustic is the word. Arriving there is a bit of a shock because the location is so desolate and stark, nothing but lava in every direction. But that is the reason one goes to the Lava Lookout.
Be prepared for a hostel type living arrangement. Shared kitchen and refrigerator. We stayed in Lono which has a little more privacy because it has no adjoining rooms but is right next to the road so passing cars are loud.