19 year old girl looking for accommodation in Barcelona

I am very enthusiastic and I love to meet new people, I'm excited about being in Barcelona for three months this summer! I speak English and French, and I don't mind the type of accommodation or the roommates that I stay with as long as they are friendly! I am a student doing an internship in Barcelona for the summer so I need a place to stay that is relatively cheap, no more than 300€ a month, and preferably near La Sagrada Familia area. I am looking for a room to rent, preferably with the bills included in the rent price, and look forward to meeting young, international people like me!