We really loved our stay at Sarah and Oscar's place.
The appartement is large, clean, and has a beautiful view in the kitchen.
Everything is available in order to cook, wash your laundry, etc. You really feel like home except you're in Hawaii :)
The appartment is 10min drive from Kona in a very quiet neighborhood, you'll have to take your car if you want to go to the restaurant or shopping.
Sarah was very responsive and discrete when we were here, we enjoyed our stay and we recommend this place if you want to be near Kona.