I booked Ken's place in winter of 2020, with the intention of renting a place to work remotely and get away from the winter. For that purpose, Ken's place is perfect, and you likely won't find a better spot for the price.
The main thing that makes this place worth it is Ken himself; he's a very thoughtful and accommodating host, and is always offering help and suggestions to his renters - restaurant recommendations, sightseeing options, and he might take you on a hike or three if you ask nicely.
Another thing that makes Ken's place great (especially if you're traveling alone, as I did), is the community that comes along with it. He's got two houses that he manages, filled (at least during my stay) with people doing the same longer-term rental like I did, which can make solitary trip more social if you so choose (though it's not required).
The house itself is in a safe, quiet residential neighborhood, with several good restaurants nearby and a bus to most anywhere within walking distance. There's also Diamond Head just up the road, and Kapiolani Park down, with the beach and Waikiki just beyond. If you need it and you take care of the equipment, Ken will likely let you borrow the house's snorkeling gear, boogie boards, fins, and other equipment that's there, too.
If I make it out to Honolulu again, I'll definitely be giving Ken a call - great host and an even better person.