My finance and I stayed at Margaret's studio during our Nov/Dec. 2014 Kauai holiday and the place was great! The location on the island is perfect and really close to town if you don't have a vehicle to get around. The town of Kapaa is really cool with lots of great shopping, restaurants and things to do.
The apartment itself is super cozy and set up for both short and longer term stays. It has a very functional kitchen with all the kitchenware you would need as well as a decent closet for storage. The bathroom is pretty standard but kept in very good condition.
Margaret was not on the premises while we were there but she has someone that stays on site who is always available if you need help with anything. Ida is very friendly and willing to give you tips about the island if you're interested.
I'll be recommending Margaret's place to everyone I know that is planning a Kauai trip!