I think in a day and age where Vampire movies are either A. pretty boy Vampires or B. Highly glossed, no plot formula vampires, it is a beautiful film.
Wherever it is really the 'best' is subjective but there is no denying it is a beautiful film. The scene at the swimming pool always raises goosebumps. I think it's a fantastic little film made all the more brilliant for the superb performances by the young counterparts. It's not often that two young starlets can literally make the movie their own, it doesn't happen with Hollywood because they do not hone real talent. The director on this def. choose two refined young actors and it shows.
'Best'? I'm not going to get into that area but for recent vampire films, it is surely one of the best to come along in some while and I love it.