What an amazing place to stay! This is hands down the best Airbnb we have stayed at and it is going to be a hard one to beat! I would say that staying at Kelly's is not just about the actual accommodation, but it is about the full local Hawaiian experience!
Kelly and her family are fantastic, it felt like we were staying at a friends house right from the start. Kelly has lots of local goodies that she brought us throughout our stay and was always super responsive to all of our questions. If you are an animal lover, you are going to be in heaven! Our daily routine included feeding the Pig, the donkey, the horse and the goats after breakfast, and petting the cats and dogs during our work breaks, and watching the red cardinals fly around while we sip our drinks on the lanai.
The "shack" itself is a standalone modern wooden apartment - it is fancy with all the necessities - there's nothing "shack" about it! We stayed there for about 6 weeks while we worked remotely. It worked perfectly for the 2 of us + dog!
The location is also nice, outside of the resort area - so you are feeling like a local - but close enough to many places of interest like coffee farms, 2 step (snorkeling spot), beaches on Ali'i drive etc. If you want to go into the "Big city", Kona is only about 30 minutes away.
I highly recommend this place, it will be your perfect home away from home!