20 year old girl looking for accommodation in Leiden

I'm a 20 year old girl going to Leiden University for the master on Middle Eastern Studies for the academic year 2017/2018. I'm a very quiet but also a friendly person, I like to hang out with friends a lot and listening to music. I am focused on my studies and do never give up.

I'm looking for an apartment to share with roommate(s), a studio or a room in a walking distance to the University in Leiden, in the city center for 400€ per month maximum.