22 year old girl, looking for accomodation in Bremen for a period of 3 months.

I am coming to Bremen to do an internship with Teather of Bremen. I have finished the BA degree of contemporary dance and art in Budapest, but originally I am coming from Slovenia. 

I am searching for the cheapest option for the accommodation, so I don't have problems with sharing a room at all. I have lived with roommates for the previous 7year, I am a clean person, which basically needs space to sleep because I will work most of the days.

In general, I am a very active person I love to hike mountains and travel around.