Penny's apartment was perfect for us - we were looking for something simple and centrally-located on a budget. Penny is really helpful, she's been living on the island for years and is a tour guide, so she knows all of the great snorkeling and hiking spots. As a note, the kitchenette listed is a hot plate on the lanai (I never knew how enjoyable cooking on a porch would be, but the single burner could be a little limiting if you're planning to cook most of your food).
We also really enjoyed the pool and jacuzzi in the condo complex. Having the boogie boards and snorkel gear provided was super helpful. We had a total blast in Kauai and would come back anytime.