Absolutely fantastic villa and stay. We have two younger children (8 and 4) and location was perfect for them. Away from the hustle and bustle of the bigger resorts in the area, but you could access them if you wanted (we did the character breakfast at the Disney resort). We appreciated that the pool and lagoon areas of the complex were much quieter than the neighbors and the villa was very quiet. We were out on the lanai one night and the villa downstairs was having a louder get-together. When we went inside and closed the large sliding doors - we couldn't hear them at all.
The villa was well cleaned and Sherry, the person who met us at check-in, walked through everything with us. Six beach towels were available for us to use, ample beach supplies were available (a nice selection of sand toys, two very nice boogie boards, a wagon to take everything to the beach), and the villa itself is a short walk to the beach through the complex's pool area (maybe 5 minutes and very easy to do with the provided wagon).
There were no negatives and if we ever find ourselves back in Ko Olina, then we would definitely rebook in the same villa!