looking for an accomodation in Lisboa from september to june !

I'm an italian student of architecture. I come frome Genova, but I'm studying in Venice .I'm looking for a room for the last year of university in Lisboa, near the university centre or near the city centre. I have many years of experience in a shared apartments, I'd like to share a room and an apartment with others nice stdents. I like to stay in group, but also i have any problem to stay alone.