Kapaa is the best, most centrality located on the island with many local great restaurants and activities nearby. My sister used to stay in Poipu, but has now converted to Kapaa. Much faster access to North Shore and very close to many great local restaurants in Kapaa and Lihue.
The unit was perfect for our family of four. My husband especially loved the 3rd toilet. Pretty view of the sleeping giant, no road noise at all from this unit, well equipped kitchen with a rice cooker and blender. Super easy contactless check in and property manager was very responsive.