21 year old guy looking for accommodations in Barcelona starting in August or September

Hi, I'm Nick I am German American, 21-year old from Denver Colorado in the United States. My first language is English but I can also speak German and Spanish. I am studying at the Institut Barcelona d'Estudis Internacionals this upcoming year and am looking for an apartment near the campus. I am looking for one or two roommates but I am open to more depending on the situation. 

I have lived with roommates before and value being friends with the people I live with. My girlfriend will also be in Bercolna doing a similar program so I need roommates who are okay with her visiting from time to time. Overall I am a clean and organized person and value splitting cleaning and other upkeep activities. I like to go out and want to have fun at the clubs in Barcelona and have a good time. I am also a huge soccer/football fan and would love to see a couple of games in Barcelona.