Hi there,
I lived in accommodation for 3 years and I would definitely recommend bringing your own decorations. The student accommodation rooms often lack personality or warmth so it is always best to add something of your own.
Also it is very likely you will keep buying or adding new decorations (as your taste or preferences may change) but do whatever makes you feel more comfortable, as 3 to 4 years is a long time. Thus it is best if you feel at ease in your room.
Best of luck and have fun decorating your new room!
Melanie
LSBU Rep