I stayed at Annie & Greg's for 4 nights in July, it was a wonderful retreat at a great price. When I return to Kauai I will definitely try to stay there again. They sent clear instructions for arrival a week in advance, and Annie was super responsive to messages while I was staying. We spoke for a bit over the phone; she was lovely and clearly cares about making the condo a comfortable and affordable place for visitors to enjoy their getaways. The space was clean and set up nicely with a comfortable bed, table to eat and work at, chairs for watching TV, basic kitchen implements and appliances, a roomy bathroom, towels and other beach items, powerful and quiet ceiling fans, and a shaded lanai to relax on.
My vacation was a mix of working retreat and seeing Kauai. The workspace and WiFi in the condo were good, and Princeville is a good jumping-off point, especially for activities and adventures on the north shore, e.g. Hanalei, Queen's Bath, Ke'e beach, Kalalua Trail, etc. A rental car is a must, and there is a dedicated parking spot available.
The condo doesn't have a full kitchen (no stove/oven), but has the essentials for making simple meals, such as microwave, hot plate, pop-up toaster, pots/pans, cooking utensils. There isn't A/C and the condo was warm when I arrived, but after opening up the patio doors for a while and putting the ceiling fans on high, it cooled down nicely and was comfortable for the rest of my stay. I *highly* recommend bringing a supply of ear plugs because with the windows open you will clearly hear the roosters that roam all over the island and neighborhoods, and they start crowing around 3am, sometimes right outside.
Random bonus tip: if you want shave ice, I recommend Wishing Well in Hanalei. I got mine with lilikoi (passion fruit), ginger, and condensed milk, and it was delightful.