We had an amazing two weeks at Jeff's place, it is essentially a mother in-law suite that's above a detached garage. It is very private and well-appointed, all the furniture was comfortable, good layout, and made it really easy to just relax. The neighborhood is quiet (just nature sounds), there are many trees surrounding the yard, and your entrance (and windows) are looking away from Jeff's house, and you cannot see any neighbors, excellent privacy! The kitchen had enough equipment so that we were able to make a few meals there, but it was a relatively short drive to a few restaurants in Na'alehu.
I would absolutely stay there again.
The neighborhood does have gravel roads, which is really common for the south end, if you have a car that is very low you'd have to drive slow to get to the house. I was there for two weeks and didn't have any problems, but if you have not visited neighborhoods in the rural parts of the Big Island, then you may not be expecting a dirt road.
Breakfast including pastries, coffee, and bananas from the yard were a welcome treat everyday.