If you're looking for a place that has the basics and not much more, then this place is perfect for you. The overall vibe I got was less a zen cottage and more a converted shed made into a place you could sleep.
Reasons for that conclusion: the bedroom shades are paper thin and aren't wide enough to fully block the glass doors, the bathroom doesn't have a spot for hand towels or a gfci outlet for a hair dryer and the layout/construction feels like it wasn't designed to be a bathroom from when it was initially built, the bedframe is an inexpensive black frame and feels a strange cost-cutting measure when considering there's also a hand-built wooden dining table in the place. Overall the place has more of a sterile corporate feel, and I also felt that in the policies e.g. no option for early check-in before 4pm otherwise you might be charged fees. The several other places I stayed on the island during my trip all had owners live on-site and were happy to accommodate if possible.
Positives: Bed was on the soft side (mattress with foam topper), but comfy enough. Plenty of blankets for the cold nights. About 20 minutes drive from Waimea, 45 from the northwest resort beach areas. Note that Waipio valley road is now closed (the lookout is still open) so you can't go down to the beach.