Elementary schools in Vienna- HELP!!!!

We have lived in Vienna for two years now and very recently my 9 year old boy has been asked to leave his school. It is a very conservative institution and it is probably for the better.... We are now searching for a new place for him. It would be great if anyone could tell me anything about elementary schools in Vienna, based on experience or heresy... Really we would like a school with some international diversity and my son is interested in music and art and also sports. Any tips are helpful!!! Thanks!!