Wasted Space
One problem that some people have is when other residents don’t respect public spaces. This Redditor described how one of their worst roommates left a printer sitting around for ages. She even had the gall to ask if her housemate would store it for her.

“She buys this printer and just leaves it in the living room for many weeks without ever being set up,” DJCyric revealed. “Finally she asks me to set it up, I say sure and do it. Well, she didn’t want it in her room (of course). Her room was absolutely filthy.”