We enjoyed our stay at Kelli's unit at the Koa Resort. Our main comment to potential guests is to arrive prepared. Kelli is very straight- forward in her welcome email, stating that they "are not a hotel and supply you with items to get started but the rest is up to you to buy." I always bring my own personal hygiene supplies anyway, but I didn't realize that such items also included laundry soap (there was one load), napkins (there were none), toilet paper (single roll, no extra), paper towels (single roll, no extra), and even garbage bags (there was ONE). I have stayed at a lot of Airbnbs, including those in other areas of the world, and never had to buy my own garbage bags.
I know other reviews claim the place was well stocked; I think this is going to depend on how much stuff was left by the previous guest. The only stocked items for us was travel-sized bottles of conditioner and body lotion (no shampoo or body soap). In our case, there was a tiny bit of coffee and creamer left over from the previous guest and a bunch of stale kitchen spices. I would definitely bring your own essentials (toothpaste, shower products, etc.) and do a complete inventory once you arrive so that you don't have to go to the store every day when you repeatedly realize you need something else. Make sure to include toilet paper, napkins, garbage bags, dish soap, laundry soap, hand soap, etc. in this inventory. The grocery store is only 1.5 miles away-- there is a Safeway and Supermarket Times (I recommend the latter - its less crowded, easier to get to, and slightly better priced).
The location of Koa resort is okay -- you are going to be about 3 miles away from the "main drag" where there are lots of places to eat, shop, and multiple life-guarded beaches. But, it is quiet, the pool is nice, and there is a lovely beach across the street (no lifeguard but great for walks). You are also closer to the highway since most likely you will want to travel north quite often -- that is where most of the activities are (snorkeling trips, jungle activities, parasailing, etc.).
I was motivated to keep the place clean after reading reviews about ants, but there were also minimal cleaning supplies. The vacuum cleaner did not work (as well as one of the air conditioners and bedroom ceiling fan, although the weather did not make these things important to us). At one point, the dishwasher would not run because it was stuck on "clean" mode -- luckily, Kenmore has a Support board -- if this happens to you, press the following sequence of buttons: Normal, Heated Dry, Normal Heated Dry. We had no problems with bugs though simply by not leaving crumbs of food.
We had a fabulous time in Maui and Kelli's unit was a good deal- it's easy to bring or buy your own supplies to save a few bucks (just go prepared). Other than that, Kelli supplied everything you need - she has a ton of dishes and cooking utensils, boogie boards, beach toys, beach towels, beach chairs, Wifi and a smart television (with Netflix, Hulu, etc.).