what is the title of this book?

i don't know the author but it's about a teenage girl and a vampire. *because every book these days ISN'T* lol, but the girl is pretty much invisible at school but she moves to this house and a vampire is living in the attic *or somewhere in the upper level of the house* if she let him stay he would grant her one wish, she wishes to be popular. then at the end of the book she's at a party and something happens and she burns the house down and walks away. i'm sorry this isn't much but it's all i can remember i don't even have any names but i hope someone can still figure out what it is.