Midsleeper bed in white and blue with swing out desk and steps as well as storage drawers. The chunky steps and desk swing out when in use, or can be stowed underneath the bed to make more space in the room for play.
Putting three or more children in one room may not sound ideal. Space configurations, not to mention decor choices for two genders and a variety of ages can't be easy. Take a look at different approaches to this problem featured on Apartment Therapy in the past: