22 year old girl from Spain, looking for accommodation in Cologne

Hello! my name is Gisela and I am a 22 year-old student from Spain. I will come to Köln for an Erasmus exchange program and I am currently looking for a flat, from March/April to July 2022. Right now I'm studying a Nanotechnology degree in Barcelona, and I will be studying a Chemistry Masters degree in the University of Cologne. I would like to rent a room (apartment or WG) somewhere not very far from the University, and I have a buget of 600€. I would also like to find roommates, preferably around my age who are also looking for a flat in Cologne. I am a really open-minded and tidy person :)