Moveable room partitions?

We live on the garden and parlor floors of a 21′ brownstone. One bedroom up front (master) and one in the back (children) on the garden level. My 5 and 7 year old daughters have recently started talking about having their own bedrooms. Looking for creative recommendations on how to layout the rear space to accomodate two bedrooms. My hope is to find a layout that uses a moveable partition so that they can decide when they want privacy and when they want the space to be shared/open. Has anyone tackled this challenge and been happy with the solution. TIA!