I took my family of four to stay at Mauna Kea Cottage for twelve days in August of 2018. The location is excellent - it is close to Waimea for shopping and amenities, but far enough from any traffic noise that it is peaceful. The cottage is located among a small group of houses on the Southern slope of the inactive Kohala volcano and so has beautiful views of Mauna Kea to the East, and South towards Mauna Loa. It is also very close to the gorgeous beaches of the West coast (Hapuna Beach State Park is probably the most popular). The sunsets were spectacular. If you visit, try morning coffee on the rise behind the cottage that offers a view of Mauna Kea. We spent some time hanging out at the cottage but mostly took day trips to see everything the Big Island has to offer.
The cottage is not a large space but works well for a family of four if you need a home base while exploring the island. The cottage is well-equipped. The kitchen is small but had everything we needed to prepare nice meals - this included several roasts and home-made bread - so an efficient kitchen space. The cottage has great WiFi and gave us full communication and entertainment capability during our stay. The beds were comfortable with nice linens and plenty of pillows. There were lots of spare towels. The bedrooms also have cross ventilation - and there were several large fans to keep us cool at night. The shared laundry area was perfect for keeping up with the cleaning demands of our two daughters. The hot water system for the cottage is an on-demand heater and so you can never run out of hot water.
Marc was an excellent host and is on-site and so was immediately available for any issues. The only issue we had - the propane tank for the hot water ran out and had to be switched to one of two back-up tanks - was fixed in about 5 minutes. Marc responded rapidly to communications on the Airbnb site.
Overall, an excellent experience and highly recommended.