The beddesk is literally a bed and a desk. And not only a bed or a desk it can also be just a block on the wall. This means that in a small student room you can create space with this piece of furniture.
Here I really worked from my own experiences. I lived in a quite small student room at the time. And I had the feeling that my room could be more efficiently organized. So what if you could have more functions in one object. Which not only has those functions but also could create space in the room.