It was our experience that you definitely need the 4-WD vehicle to get up the steep and lengthy path to the location; it was raining pretty hard when we arrived and there was no way we could have driven it without the 4WD. (Also, if you are planning to go to summit of Mauna Kea, you will also need 4WD to do that.)
Great and secluded place. The balcony has a wonderful outlook to the coast; there can be some occasional mosquitoes but there is bug spray and citronella candles provided. We spent lots of time on balcony, would go inside only if mosquitoes worsened (our experience was mosquitoes were worse in afternoons) l, and we only got a few bites.
Thoughtful place and accommodations with a very responsive owner. Some of the furniture and kitchen items were older though functional. Some of the light bulbs were out but when we chatted the owner, they quickly responded and the caretaker was there the next day replacing the bulbs. The main room doesn’t have overhead lighting and could get quite dim at night, even with the existing lights on. That dimness may be a positive for some but could also be challenging if you have any vision limitations. Overall was a very nice and secluded place that we enjoyed.