This person's just moved in, and their neighbors are already irritated with them… That's never a good sign! When you first move into a new building, chances are you'll meet your neighbors at some point. And even if you don't meet them, you'll definitely hear them. In many apartments, the walls are thin enough to allow in sounds and smells. So you might not know your neighbor by name, but you know that he and his kids eat a roast for dinner, since you can smell it cooking and hear the dishes cli…