A student looking for an apartment or a room in a shared apartment

I am a future student of UAB. I am very sociable and active. However, I am very respectful of others and therefore, can be a very quiet room mate! Also, I expect the same from my future room mate.

I can cook and I like to keep my room/ apartment very tidy.
I speak English, Slovak, Czech, German, Serbian and a bit of Spanish and French, so if you speak any of these languages, we'll find a way to communicate! 
I do have a year old Shi Tzu that I am planning on taking with me. He is a darling- doesn't bark, is well trained and one does not know that he is in the apartment. Although, he LOVES to cuddle! hahah

Therefore, I am looking for a flat or a room in a shared flat in Barcelona. If renting the apartment by myself, I am willing to pay up to 350 euros a month, but if I will share a flat, I would like to pay about 250 euros monthly. 

It would be great if the apartment would be near the subway lines that would grant me a quick transportation to the UAB.

Thank you and looking forward hearing from you!