You should absolutely book this rental. The room and views are amazing, the area is quiet, beautiful and all the people we me were super friendly with some nice food options near by. We spent one day in Kona and were very happy we stayed on this side of the island as we prefer quiet and to be more in nature rather than having a ton of attractions.
The one minor complaint was finding this place at night and in the rain was nearly impossible. Being tired and hungry after a long travel day likely compounded the issue but we ended up not being able to see the small dirt driveway and markers pointed out in the directions so we drove past the entrance multiple times before giving in and getting a hotel to come back and find it the next morning. Finding it off the directions during the day was very easy though and had there been cell service in the area I know Rachel would have been happy to help as her communication was always great but we were unable to call out until already back to town where the hotel was.
If you book this location I would simply ask for the actual address as Google Maps does recognize it and then go through Google settings and download the areas map "for offline use" and the GPS will take you there without issue as we used it often to find our way back during our stay.
It's worth emphasizing that this place is truly amazing and despite the issue in finding it initially we would absolutely recommend you stay here if you get the chance. We would love to come back again in the future if possible but hopefully stay longer.