One of the best things about this university is the amazing library, which during exams sessions is open all night.
There are quite a lot o activities next to regular classes, a lot of languages courses to choose from and very good sports offer.
The main campus is very nicely located and pretty but unfortunately many faculties are not located there and then the quality of infrastructure differs very much, sometimes being quite bad.
When it comes to classes, it is nice that you can signup for many extra subjects that are not part of your major (such as a history of cinema or knowleadge about Warsaw). The biggest disadvantage is an oldschools style of teaching and testing but it also depends on the faculty.
Overall it is a good university with a lot of opportunities.