We stayed here for two weeks for a half-vacation half-workation. It is a beautiful home, airy and spacious and comfortable for four adults and one infant - although you could squeeze in a couple more. It's in a great location - 10 minutes to Hanalei (when the road is open -- pay attention to the current schedule!), 10 minutes from Anini Beach and Kilauea, and walkable (~25 minutes) to the Princeville Center. The wifi is surprisingly good for an island in the middle of the Pacific. There is an iMac in the master bedroom on a very tiny table just large enough for a keyboard and mouse; unfortunately it doesn't support being used as an external monitor.
We would have loved to have some staples in the kitchen (like salt and pepper, oil, etc) but unfortunately there were none. However, there is a reasonable amount of equipment (e.g. blender, rice cooker, what seemed to be a pressure or slow cooker) and having access to a grill was great.
The air conditioning is not central, and only the bedrooms have AC units: to use, each one must be hooked up to vent through the bedroom screen door; running two at once on one half of the house (non-master bedroom) tripped a circuit breaker, so keep that in mind. The master bedroom is open to the bathroom and has a high ceiling, and the AC unit wasn't powerful enough to keep us fully cooled during the day (when it gets hot and were working inside). However, we kept the windows open at night and were comfortable with the ceiling fans, so didn't use the AC that often. That being said, roosters will crow at all hours of the night, so bring earplugs if you are a sensitive sleeper.
All in all a nice home that we would return to for vacation, but probably not for a workation, due to minimal comfortable working space that is cooled (although if you're productive when hot -- by all means do it!).