Hola! Muchas gracias por tu mensaje! Barcelona is a great city for party animals. Everyone else who stayed at a hostel where I stayed was college kid who just wanted to party there during weekends.
But there is so much more in the city. I definitely recommend going down to Barri Gotic area and mercat de Boquería. I heard Miro Foundation is a cool place to visit if you like art. Also if you stay in Barcelona more than just one weekend, take a long distance train and go to Figueres for Dali museum, or Tarragona for a peaceful moment.
I hope it helps!