My wife and I spent two days in Naalehu, and those two days were the best days of our trip. The location is a bit out of the way -- but that was perfectly fine because we liked it that way.
Ka'Haiya was a perfect hostess and the place was super-clean. She had decorated the place very thoughtfully with many interesting features. The night sky is awesome and sunrise was the best. The location is not too far from Green Sands Beach --- a must see!
Just a heads up --- bring some drinking water (even though Ka'Haiya thoughtfully kept 1 gallon for starters). Most places close before 7 pm -- take that into account; the place is rural.
Can't complain of one single thing!