Ah a young firstie that doesn't know about the room. He could easily tell her it was some random room for class, or that Arithmacy was in there. It would be funny to watch as she tried looking for that room. But he decided to cut her a break, since it was her first day. "It's a room that only shows up if you need a room. So if you really need a quiet place to study, then if you walk around near it, a door will pop up and you'll be able to use it." He knew it was on the third floor, but he wasn't going to tell her that.