Study / Is the University of Warsaw good? [26]

Hello, I am natural from Brazil and I'm currently living in the republic of Ireland for about one year now, I've been in Poland for about 3 months and I must say I am very interested in the country and studying there, so I was wondering if you guys could help me with some information.

The University in Warsaw is good? I mean I heard really good about it but no one better than Polish citizens to confirm me that, do you guys think I would get a good work after I finish my studies there?

Is it possible to find a job there without speak Polish? even though Im very interested about learning Polish, I might start learning it once I get in Poland.

there are foreigns in Warsaw? is it commum in Poland?

Thank you very much, waiting on some replies.