Looking for a new house for long term in Aachen

Heyy, I am Sattwik, I am a PhD student in Aachen. I am looking for an apartment ideal for single person or a young couple. I am looking for places near to the centre, or close to the Uniklinik, which will be convenient for my work. I need places with proper high ceiling, as I am currently living in an attic apartment,and I am feeling claustrophobic. Also, a decent size kitchen would be nice.