I think you will be pleasantly surprised if you book any of Fern Grotto’s listings, though the one we stayed in—Coco C—was one of the best equipped listings I have ever stayed in on Airbnb. It has pretty much every amenity you can think of plus a few more you probably didn’t think of. I highly recommend staying at the Fern Grotto Inn.
The listing location is central to everywhere else on the island, which makes it easy to go to either the north or south shore in about 20-30 minutes each way. Everything else in Kapaa is also minutes away. The listing is also right along the Wailua river with a canal that backs right up to the property’s doorstep.
One thing that is clear about Fern Grotto is that Paul clearly reinvests the money he makes back into the property, which is something most other hosts do as little as possible. The listing has everything you need to feel comfortable and there are loads of other items (SUPs, kayaks, snorkeling gear, beach chairs and umbrellas, etc.) that you can use while you stay. It’s all very well organized and operated by Paul. My wife and I were very impressed.