Firstly, int he UK a dorm room is specifically a large room with rows of beds where you have no private space. They aren't used any more and certainly no university has them. You will confuse people using that term.
University accommodation varies enormously, there is absolutely no standard. Students generally get what they are given and make the most of it, it's just a sleeping space after all. It will be furnished, and there are rules on decoration that are specific to the building.