19 years old girl with two girlfriends. erasmus student, looking for accomodation in Aveiro

Hello I am Ruzanna and I am from Armenia. I am 19 years old. I am looking for an accomodation with fully - furnished rooms and kithchen in the center of Aveiro, near the Aveiro university with three bedrooms.  I will arrive with my two friends. We are planning to continue our second semester of study at Aveiro University ( 5 months ) . We are going to rent the entire property. But before our arrival we also need the proof of accomodation for Viza.