I did my initial class 1 last week at the military hospital in Warsaw. Went there at 8 and was done with the testing at 11. Had my medical in hand after lunch.
Price was 600zl and you have to make an appointment first.
It doesn't hurt to know just a bit of Polish.
Not sure where your vision is at, but I've only heard good things about the cases that go to decision of the chief doctor.
I can't post links since I'm under 10 posts but have a look at: wiml.waw.pl/?q=en/content/pilots