2 girls, 19 years old, are looking for a cheap apartment in Porto

There are 2 of us, two girl, 19 years old is each of us, and we are looking for an apartment with a single room, or with two rooms in Porto, next to the Faculty of Economics at the University of Porto. Not more than 220 euros per month. it is important for us to know that the apartment is very comfortable, next to the university, to a metro station. Both of us a planning to stay for at least 5 months, but there is also the chance to stay for the entire year, so we are hopping to find an apartment, not very expensive and one with good neighborhood.