On our stay we Loved the how the house is in fact a tiny house, but a tiny house that has everything it needs in it. It might be a little hard going up the stairs, but I wouldn't say is much to worry about if your decently young or active. On our stay we had car trouble for the first few days and our hosts went out of their way to bring us food, cook a bit, and bring us water as we were stranded under the rain for a while. Their neighbors even gave us a lift the first day their along with another driver who gave us a lift to starbucks. Everyone that we met is super nice. The road to the house however, is a rocky road and we arrived super late because of the transportation problems and the nearest store is about an hour and a half away, but if you had a vehicle as we did after the first few days it was swell.
The location is in the center of Hilo and the volcano and there is a paved road everywhere else leaving it to be a smooth ride. We had trouble entering the volcano, but because the house was so close to the entrance we were able to go quick in the morning and drive by before our flight back to Honolulu. All in all I would definitely return if I could! Thank you for letting us stay in your tiny house and for helping us so much!