Pro's: Juliana is an excellent host -- you don't need to worry about a thing, because she is so attentive and helpful. The location is perfect for exploring the North Shore and hiking areas, plus is close to three great upscale restaurants -- Bar Acuda, Bistro, and Piazza -- as well as great eateries like Kilauea Fish Market and cool sightseeing stuff like the Kilauea Lighthouse and a local Taro Farm and botanical garden. Also, the place itself is just clean, spacious for its square footage, and updated.
Con's: Mainly just proximity to neighbors and noise. There is a door in your living room that leads to the neighboring unit. It's not a big deal, but you'll definitely hear what they're doing. The place relies on open air flow, so you also hear everything outside as well. If there are kids and families around, you're not going to sleep in or get to bed early. That said, generally you're not going to Kauai to spend time indoors.
Overall, an excellent place and a great value.