is tough to get in?
Warsaw University is very reputable school in Poland. Generally it's not easy to get there. But the Urban Planning don't belong to the most popular fields of study there, and so it is easier to be admitted.
Do they have classes every day?
The classes are mostly four days a week.
how is it going to this school?
I found different opinions. People said that too much emphasis is placed here on geography. More theory than practice. Most of the staff are geographers and people dealing with economics, regional growth, development aid, etc. Earlier some complained that there is a lack of technical things, drawing, playing with plans etc, but maybe it changed over time. Studies are not very difficult to finish, but the question is how much you are determined and interested to self explore different aspect of the architecture, urban planning. Pure theory class is often not sufficient to get a good job.