I had great college roomates. We respected each others things, never borrowed anything without asking first. We let each other know if we weren’t coming home at night, but we didn’t have cell phones back then, so I guess if a roomate is worried now they can just send a text to make sure you are ok.
One college roomate of mine complained about her freshman roommate, because she would just buy things and fill up the room with her stuff. Furniture for her sweaters, things like that. It was like she was an only child allowing someone else to live in her room. To some extent we all bring some of our own stuff to the dorms of course, but being aware of each others space is a good thing to do.
My first roomate already had a TV, carpet, and fridge for us, which was great! She always let me use them, which I appreciated, I bought a couple other things to supplement the room, and I did the vaccuuming.
Also, my third day of living in the dorm she asked me if I wanted her to pick me up season football tickets, because she was going to stand on line and buy hers. It was nice of her to offer such a thing when we barely knew each other.