Bethany is a great host. She was very responsive and got us an upgrade. I would recommend anyone to book one of her listings.
With regards to the Ko Olina Vacation Club, you can expect it to be on par with Marriott standards. It is great for families as the resort has pools, lagoon and other outdoor spaces to keep you occupied. Ko Olina is a bit farther away from the usual tourist spots. So expect to drive 45 minutes one way if you want to go to east shore or north shore. Also do not expect to get any view with this booking. We got a parking lot view. Bethany tried to switch the view for us but the hotel was sold out. But it did not matter to us as we hardly spent any time in the room. Overall I would recommend this property to families with kids.