As shown in the photo above, the raised beds do not have to consist only of cabinets and desks. You can create just about anything you want in the space under the mezzanine bed. Of course, you could have an office space, but a comfortable sitting area with an ottoman is also an option. Other options include a general play area, a workstation for arts and crafts, a place to play video games or a cozy reading corner with loveseat.
Some simple curtains under a loft bed give the space a sense of intimacy. They also separate from the space under the bed to give the impression of being in a separate room, which can be useful in shared rooms.