We stayed for a week, with two young kids. The location was really very convenient; both Kailua and Lanikai beaches were walking distance. The apartment was clean and had all the basic cooking amenities. The washer/dryer are right next to the unit and free to use. The beach chairs were very comfortable. There is also a water hose outside the unit to rinse off sand from the beach.
One thing to note is that if you have a big car or SUV, parking into the designated spot may become bit of a challenge. I would recommend renting an economy or compact car.