Our stay was wonderful!! I did not ever meet Margaret or Ida, but did exchange correspondence with them and they were pleasant.
We did interact with Arnold a great deal and he was extremely helpful and friendly. He made a large difference in quality of our stay.
The apartment is small but cozy and perfect for the two of us. The newly renovated bathrooms were lovely. When we arrived there was a bowl of fresh fruit and new coffee and granola waiting for us. A lot of other items were already provided (e.g bug repellent, sandwich bags, salt and pepper, etc) or otherwise were contributions left by past guests.
The apartments are conveniently located near several stores and restaurants that were walking distance. Additionally, you'll be close to Lihue airport and can drive to both north and south shores easily.
All in all, we enjoyed our stay at Margaret's apartment while in Kapaa and had a blast in Kauai!