Unofficial627, I adore OKW and have stayed there many times. I would not hesitate to tell anyone to stay there. I especially love OKW's main pool area. It is usually not very busy (especially late at night when I primarily swim) and quite large.
The OKW one-bedroom villas are quite large. My husband (the runt in our family), myself (the tall one), and our teenaged son (very tall) and young daughter (tall for her age) have all fit in a one-bedroom villa quite nicely. I should mention that we normally book studios when we stay there. In the studio, we have plenty of room. And in the villas, we have way more room than we need. Have no fear, your family will fit nicely in a villa at OKW. Enjoy your vacation.