The Erasmus Student Network at University of Warsaw runs a Mentor Programme which helps international students to aclimatize in the new social and academic environment. This includes assistance in finding a flat and registration for courses, integration with other international and Polish students, organising trips and other activities.
Please, keep in mind that you won't get your Mentor immediately - the matching process will start around August.
Best regards,ESN UW Mentor
If you have any further question, don't hesitate to write to firstname.lastname@example.org