they're around the same age and they're both really social. she's studying costume design at tisch so maybe they met around campus and she's been to a few of his gigs. she could have come home to the news that her old roommate decided to move in with her boyfriend so she was kinda stuck. BUT instead of handling her problems maybe she went out and hit up one of his gigs. they could have recognized each other and started talking and discovered they both were in need of a roommate