Italian/portuguese girl looking for a cheap accomodation in Lisboa

I graduated in june 2018 in Mass media and politics at University of Bologna and I won an Erasmus Placement in Lisbon at the Camara de Comercio Italiana para Portugal. Indeed, I consider myself both portuguese and italian because my mother is from Lisbon and since I was born my wish has been to go in Lisbon and discover how would have been my life if I was born in Lisbon. I passed a lot of summer in Lisbon but this is finally my occasion to life the Lisboa life! I can't wait for it and I am really grateful. I am a resilient and positive person, I adapt to every kind of situation. I am looking for a cheap bedroom because the university pays me only 450 euros per month and with this amount I should try to pay both my room and stay. Please help me :) You will not regret it :) I can cook pasta and make italian coffee for everyone :D