We stayed in Karen's amazing Hale Iki for a week. It has all the amenities we needed, especially the complete set of beach gears (chairs, umbrella & cooler) which made us look more local. The location was great, up the mountains so much cooler than Kona but close enough. We were absolutely fine sleeping without the AC. The wifi was stable enough to sustain one week of working remote with numerous conference calls. Karen was quick at responding messages and was physically at home when we needed her sometimes right next door. The only note I'd add is if your rental car doesn't have high clearance (e.g. a sedan), drive slowly on the property as the parking area itself is unpaved.
Overall it has GREAT value and I'd recommend if you are going to stay on the Kona side for a few days and want to have a more local feeling.