OKW has the largest 1 BR and GV out of all the
DVC properties. The studios are also slightly larger but do not seem larger because of the layout of the room and the 2 queen beds vs 1 queen and a sleeper sofa. The 1 BR and GV definitely are and feel larger. The furnishings in the units are very light and pretty.
It is much more convenient to have a car at OKW due to it's location. You will have the convenience of parking your car in a parking lot in front of your villa. As another poster stated getting a first floor unit will save you walking up flights of steps with tired little ones after the parks. The newer buildings do have elevators but the majority of the buildings do not.
OKW is a quiet, laid back place so afternoon naps/rests and early bedtimes for your children will be quite easy.
The units near the hospitality house are within easy walking distance to the main pool, restaurant, snack bar and gift shop. The units farther back are quite a distance to these things so you might want to request a unit close to the hospitality house.
Olivia's is the restaurant at OKW and it has good food at reasonalbe prices, the snack bar has typical snack bar food but it is also good especially for a quick lunch while at the pool.
Since you are considering purchasing DVC, you should take the DVC tour while your at WDW. The DVC reps will show you models of all the various properties and explain all about this great vacation timeshare program with no pressure. You will find that all the DVC properties are different and unique in their own way. Have a great vacation!