Looking for an accommodation

I am a Finnish girl who is starting her PhD in Münster from 1st of March 2017. I am looking for an accommodation (flat/studio/apartment) which can also be shared with other women. My working place is at Schlossplatz 4, it would be an advantage if the flat is located near the department of biology (University of Münster) but it's not necessarily required. I am going to stay in Münster for 3 years so a long-term contract would be preferred but I am also interested in short-term contracts. I am a social, non-smoking and sporty girl who likes running and horse riding.