Looking for flatmates and appartment in Barcelona (March-August)

I'm going to Barcelona for an internship. I'm a French student in Business School and I'd like to share an appartment with international people (interns or student) who like to go out on week-ends. I like sport, films, restaurants, bars... and I'm quite easy to live with. I'm here to improve my Spanish and I also speak English.

The best for me would be to live near plaza Catalunya, but if it is elsewhere near a metro station there is no problem for me.