We absolutely loved this place! We've stayed in many airbnbs and this was one of our best experiences. The unit is lovely, simple but very tasteful with beautiful artwork (an inquiry to the owners re: where it came from led us at their recommendation to the Dovetail Gallery and the artists' community of Holualoa, which I highly recommend). And the little beach that happens to be a 1-minute walk from the unit is technically a part of Kahulu'u Beach, but it is very secluded. It's not a snorkeling or swimming beach, but it is the loveliest place--with shade available--to get your feet in, to sit and read or do artwork, and to watch the most gorgeous sunsets. There will only be a few other people there if any.
Angel and Mike were super-responsive, helpful, and friendly. And considering how big the Big Island is, the location was great--certainly you can take long day trips to Volcanoes National Park and to the Hilo coast (especially the Bioreserve/Botanical Garden), and you should, but there are beaches and historical sites galore easily reachable very close by. You're not right in the middle of Kona, but if you want to spend time there it's right there.
This is a great place. Highly recommended in every way.