I stayed with Kepi & Jim for over a week (I was working remotely and went out on afternoons and weekends), and it was wonderful. For a plant lover such as myself, their place is truly magical--you can tell how much care has been put into making this a home, from Kepi's paintings to Jim's amazing garden. The room is cozy, and very doable for myself and my partner, given that there's also a patio (lanai in Hawaiian) and the garden grounds. The house is also close to lots of great sightseeing: 30 min to Volcanoes national park, and 15-20 min to Hilo. Kepi and Jim were both very attentive and communicative about any needs that came up throughout the week and we appreciate them so much for an unforgettable first week in Hawaii. They also have great suggestions about what to do and see: thanks to Jim, I visited the nearby botanical garden which is absolutely incredible.
As other reviews have noted, walls can be thin and you can hear other guests. The coqui frogs make a lovely sound to my ears but they are loud, so if you are a sensitive sleeper, make sure to bring ear plugs. Lastly, I'd add that Hawaii is a tropical location and there are bound to be critters (beetles, ants, geckos, etc) everywhere. For the hosts part, they keep the rooms super clean but I would caution guests to try to eat mostly outside on the patio so as to avoid getting bugs inside if that's something you care about.
All in all, my partner and I loved our time here and hope to come back and stay with them again someday!