This is Unit 20 at Sea Mountain Colony One. Compared to Unit 18, where we stayed a year ago, Unit 20 cost $5 less per night, was more spacious and had almost as good a view (18's is unobstructed; 20 overlooks 18). Unit 18 was better appointed and better maintained. We believe 18's owners use it themselves, while 20 is strictly a rental.
The Colony One W-Fi was unsatisfactory. When it functioned at all, it was terribly slow. If you want to stay walking distance from Punalu'u black sand beach, Colony One is your only choice, so you have to sacrifice web access or hope your cellular option will work better.
The owner of Unit 20 is a very nice California lady who may not be fully aware of deferred maintenance issues. If she were to get those corrected, I would give the unit a higher rating.