We've done about 20 cruises in Quad rooms on many HAL ships including several Ocean View cabins on Zaandam. We started when our girls were young, and continued to do so through their late teen years. We established a routine over the years and it worked well for us, especially given that 3rd and 4th passengers were free or nearly free with just taxes and port fees on many of these cruises. As others have noted, you'll have two twins or a queen bed, one that drop down from the ceiling and a couch that flips over into a bed. It does not pull out so it will not interfere with anyone's access to the bathroom. We found we had more room using the two twin bed configuration, and, if your children are old enough, consider ditching the bunk ladder, as it takes up room, as an older child can easily climb up using either the couch arm or one of the twins.