Student who are looking for a flat-share in Warsaw center

Hi, my name is Bérénice and I am nearly 21. I am moving to Warsaw at the beginning of September and I am looking for a house-share. Ideally with students too, who are friendly and welcoming.
So I am looking to rent a room in a apartment in the center of Warsaw until mid-July. 
To give you a idea of who I am : I am always smiling, trustful, fun, hardworking, tidy.. I wish I could be able to find people with these qualities too, to share an apartment with them.