My family had a wonderful stay here for 7 days in the end of May - 2 grandparents in their lower 60s, two mid- 30 year old couples, and a combined 4 children (two 1 year olds, a 5 year old and a 9 year old).
PROS: The house was equipped with everything you need for a fun beach vacation - lots of towels, beach chairs, sand toys, boogie boards etc. We happily added to the assortment by contributing 2 beach umbrellas, too! The house itself was clean and stocked (from bathroom toiletries and sunscreen to basic kitchen essentials), and we appreciated the indoor and outdoor spaces available - especially the outdoor shower! There are tons of areas to sit down, and we never felt like we were on top of eachother which is nice considering how many of us there were. The house is very kid friendly and we took advantage of the pack-n-plays, high chair and car seats! They have AC in all rooms but one which work well enough to cool down the whole place (and it was in the 90s when we were there). The location was 5 minutes from a beautiful beach (Magic Sands), but when we were there the surf was too rough for the kids to swim. Even so, we still went a few times throughout the week, but we also ventured further north to calmer waters! It is also located 10 minutes from downtown, and about 30 minutes from captain cook/place of refuge/ two steps. Also, the owners could not be more friendly or helpful, with quick communication!
CONS: The house is located on a fairly busy street, but we knew this before we booked it from other reviews. It didn't bother us, but you can see traffic out front when on the lanai. If you end up using the 12 person van, we recommend parking at the bottom and walking up like the owners recommend. We drove up to the top once and had a little issue on the first day - so needless to say we parked at the bottom for the rest of the trip. We were also notified a few days before the trip that the van AC was broken. We decided to keep the van instead of renting a car, and in the end wish we had just gotten the car. While the van is so convenient for those traveling in a large group, it gets stifling hot without ventilation.
Overall we wouldn't hesitate to stay here again if we decided to travel back to Kona!