Can you live comfortably with 2850 PLN?
That would be poor wages even for a young single foreigner with no bad habits (alcohol, tobacco or girls). Your savings potential would be close to zero. There's no point in coming to Poland for so little money.
Łódź has the reputation for being one of the uglier and more depressing cities in Poland, and is one of the few cities in Poland that has gotten worse over the years instead of better. I used to live nearby fifteen years ago, and quite enjoyed the city then. But then it suffered many years of neglect and decay under the worst mayor in Poland until he was kicked out, and he left the city with huge problems that still haven't been sorted out. The once vibrant downtown main street died because huge shopping malls were built at either end. The best and brightest young people left to work for higher wages in nearby Warsaw or went abroad, leaving the old and less educated behind.