We stayed in poolside villa C210 from March 11-15, 2013. The villa is beautifully decorated - hardwood floors, huge kitchen with granite countertops - tons of space for a family of 4 (kids ages 11 and 14). We loved having a separate bedroom AND bathroom for each kid. Also, having a washer and dryer was a must for a stay at the beach. Like other reviewers stated, we could hear footsteps from the villa above us. However, it was more "background" noise and we did not find it disturbing.
We thought the location was perfect. Shipwreck Beach and the Hyatt is a 5 minute walk on a paved walkway. Brennecke Beach and Poipu Beach are about a 3-5 minute walk in the other direction. Brennecke was great for boogie boarding (used the boogie boards provided by the villas). We saw turtles in the waves on the edge of the beach by the rocks as well. Poipu was calmer and great for snorkeling. There was a turtle very close to shore and we waded out right next to it!
There is a grocery store in Koloa - about a 3 minute drive away. There are also nice restaurants close by in the Poipu shopping area.
One day we drove to Ke'e Beach on the north shore and hiked the 2 mile portion of the Kapalau Trail. It's about a 90 minute drive to Ke'e Beach and well worth it. Stunning views on the hike!
I would definitely recommend the Villas at Kai! Great location, beautifully decorated with conveniences of home, attentive management.