Dutch student looking for a place to stay in Berlin for approx. 3 months

I am a dutch student Interaction Design and I will be doing my internship for 3 months, starting from the 4th of september. I'd preferably be within a 10km radius of Mitte so I can take a bike to my internship and my maximum budget is 500 euros a month.

About myself: I am 22 years old and I live on my own in Arnhem, the Netherlands. My hobbies include art, reading, electronics, programming and listening to music. I like being in touch with people I share a house with, like occasional cooking together!

I don't smoke and I am a tidy person, I will only be bringing a suitcase with clothes and some smaller belongings. For the furniture, I don't need more than a bed and something to sit around to be satisfied but anything more is better of course.

My german is not too good but I can manage to get around, and I'm very willing to learn better