Decorating a dorm room

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Hello /adv/

I've recently moved into a dorm room - it measures 345 x 345 cm. (roughly 120 sq ft, or 12 m2)
I really need some ideas to make it feel like a home with somewhere to sleep, room for guests/a chill area and an office/desk. Any ideas are welcome, including a full plan, how to get plants inside, what colours to choose and what kind of furniture would be good. I like the nordic style with wooden furniture and the occasional antler-as-a-coat-hanger.

My biggest issues are the placement of my door, the tilting ceiling(265 cm at it's tallest (north), 220 at it's lowest (south)) and the 3,4 meters windowpane. Pic relevant.