Why not turn your box room into a study / office, stop working from the bed or the sofa and take over your box room or a any room with the most limitation and transform it into something really useful.
These units house two single beds so they can be utilised not alone as an office but a spare bedroom when friends or grandchildren visit and a built in media unit to keep them occupied.
Using the space you have for extra storage for whatever the purpose will always benefit you if planned and fitted properly.