Let me first say that this is probably one of the coolest locations in the North Island. You are completely on your own, no house or people within view. The bed was very comfortable, the sheets were clean and the bathroom to. The bathroom, bedroom (camper) and seating area are all completely separate, but connected by a sheltered porch.
We went during cicada season, so basically when the sun went down and the lights were turned on, the windows and doors had to remain closed, since every cicada and moth within a 1/2 mile radius made a b-line for our well-lit faces, but that's nature, which is theoretically what we came to see. The plugs didn't work when we were there, so we couldn't charge anything, but that may have been our own stupidity rather than the bach itself. If you need to refrigerate, you'll be relying on a plug-in chilly-bin fed by solar panels, so maybe pack and ice bucket.
If you're expecting a luxury stay, don't be ridiculous, though I will challenge you to find a nicer location, for we certainly haven't thus far.
Conclusion: I would say this bach is best used as a base of operations rather than a destination in and of itself. It's a big step up from camping, but not as well equipped as your average hotel.
Hosts were nice and relaxed, though we never met face to face they definitely seemed cool.