Book this place if you get the opportunity!!! The house is in a fantastic location, and with the ocean literally right behind the property you can not beat all of the views or opportunities to enjoy to deck! We LOVED wandering around the tidepool rock area right off the back of the property every day. Its a very enjoyable and doable walk to downtown Kona and there is a little sand beach right around the way. You'll definitely still want to (try) and rent a car so you can explore the island overall.
Our 4 adult + baby group was comfortable and felt at home the entire week! Both rooms are large and extremely comfortable and the outdoor shower off the room balcony is super unique and enjoyable. Having AC is both rooms was very VERY needed, and is something you cannot find everywhere. The kitchen was well appointed with everything you might expect including some awesome additional appliances like an instantpot.
Kati is a very great host, and was on hand to offer whatever suggestions or answer any questions we came up with. She also has a lot of equipment already at her place; beach toys, water shoes, umbrellas, towels, first aid, laundry, etc etc. Again, cannot recommend staying at the Mermaid Manor more highly! Hope to be back some day.