For the most part, I like having my rats in the room. I like their noises at night, even though they are usually fairly quiet. They run around for a while before being put up for the night, so they'll sleep.
As for chewing, they don't chew the cage bars, but they will chew on fabric and stuff. You should be okay with having them in your room unless they are big noise makers, like Syren's rats apparently area. xD