Classifieds / Flat in Krakow for German students for one semester [24]

Hello!

My name is Richard and i am from Germany! We are a group of four guys that are going to live in Krakow for one semester. (1st of October - end of February)

We are looking for flat at the moment but cannot find a proper one. Most agencies want a huge help fee....
Can anybody help me where to find cheap flats?
We would like to have a flat with 4 bedrooms, which is not easy to find...

Thanks

kind regards
Richard