Highly recommended.
Unfortunately, Twilight's shittastic empire makes the premise of this movie seem unattractive, but I promise it is worth watching.
Basic introduction - Swedish boy is bullied at school. Too much of a wimp to do anything about it, so he spends his evenings in his apartment courtyard with a knife pretending to get revenge. One night, some people move into the apartment next door, and a girl joins him in the courtyard...and the girl is a vampire.