We had a great stay at Naomi's place. It is part of the Kapa'a Sands condo complex. The apartment had all the necessary amenities for a comfortable stay, including coin laundry near the main office, and Naomi was super kind and responsive. Be sure to consult the handy Kaua'i visitor guidebook in the apartment!
The location is central to all the areas you can visit on the island. It's really not necessary to find another area stay if you're willing to drive to other parts of the island. Note that traffic is heavy in this particular area during peak hours.