20 years old student looking for a room in the center of madrid

Hey, i am an architecture student looking to rent a room in the center of madrid in an appartement with other students, i will start to attend the Universidad Europea de Madrid (UEM), i am looking forward to meeting new people and living with cool room mates. I am looking for an accomodation in the city center or in a very active student area where going to places by walking would be ideal, also i was looking for a place where metro lines or bus lines are just next to it,

:)