We had a great 11-night stay with Ken & Annette in Kailua-Kona despite a hick-up with the water heater. They were very responsive to the problem and worked on getting it resolved asap and even gave us a small compensation for the inconvenience.
The condo is located in great spot with a shaded parking spot included (big plus). It has easy access to everything you might need and want from supermarket, restaurants, entertainment and beach. You also have a lovely view of the coast line from the lanai and even just sitting there watching the tropical downpour is enjoyable.
The three flight of stairs I’d say are not really an inconvenience besides for arrival and departure day when you have to carry your bags down ;)
In addition they really have stocked the condo with everything you could possibly need from beach things (really everything -snorkel gear, boards, shades ) toiletries, plenty of towels and sheets and a fully stocked kitchen. The only things we missed was a vacuum to get rid of the sand properly and coffee grinder to kick off the morning with a cup of Kona coffee.
Highly recommended!