1. Comparatively safer
Using everything in the room alone, without worrying about being disturbed by roommates coming back late at night, nor having to worry about roommates bringing strangers back.
2. Independent kitchen
Everything in the fridge belongs to oneself, no need to worry about roommates messing up the kitchen, no need to worry about others casually taking one's belongings.
3. Living alone is pretty nice
Living with parents in China, when studying abroad, one should try living alone. Comparing, you'll find that living alone is still better, after all, living with roommates means living with peers, not parents.