Princeville is a great place to stay on Kauai. It was our first trip to the island, and our stay was very comfortable. Jeff & Shana's place is very functional, and proved to be a very good home base to explore the island. Walking down to the Turtle cave is something I would certainly recommend for people who are fit and mobile (on days when the ocean is calm).
They were very responsive, and helped us with recommendations on the island.