Our family recently stayed at Kerinne and Mike's home in Kurtistown. The location was excellent for multiple day visits to Volcanoes NP without having to drive all the way back to Hilo. There are also a selection of amenities in the area including a 7-11 as well as restaurants and a general store in Volcano Village. You would have access to pretty much everything needed during your stay.
The house itself was very comfortable for a family of 4 and Kerinne and Mike were very cordial keeping us informed before and during our stay and taking time to show the kids the animals on their property.
I would definitely stay here again if I was in the area to visit Volcanoes NP. Thank you Kerinne and Mike.