Work /
Salary of a customer service representative in Krakow [28]
You will definitely not live like rat or have trouble making ends meet with that salary. You say you don't shop a lot of clothes, don't go clubbing, don't smoke... I'll even say that you will have to work very hard spending the rest of your net salary by just living. I'll go as far and say it's impossible.
However you will of course have extraordinary expenses from time to time. New phone, computer, cooker, micro (?) and that can set you back some. Electronics have the same price in Poland as in Sweden basically.
Some examples:
Public transport - 89 pln/month
Phone - 40-50 pln/month
Internet+TV (250 mbit/s and ~100 channels) - 140 pln/month
Car insurance - 200 pln/month
Typical main course at a restaurant (nice one) - 60-80 pln
Lunch - 15 pln
Beer at the pub - 10 pln
Beer at home - 5 pln
Vodka at home - 30 pln
Decent pair of shoes - 150-300 pln
Quality shirt - 100 pln
Jeans - 200-300 pln
You can surf in on Tesco website since you can order food online from there. It will give you a good overview of costs of groceries and what you normally buy. Chicken and pork is very cheap down here.
I spend half my net salary on rent, and barring any unexpected expense I never spend all my money during a month. And I'm a smoker and enjoy my occassional nights out, and also needs to pay CSN on quarterly basis.
You won't have a flashy life, you can't buy a house or a shiny new car. But it will be calm and good, but don't expect to save up a lot of money. Have an exit strategy to go back to UK/Sweden. But with that salary you can comfortably come down and feel for yourself if you can live on that money or not, or if you like Poland or not (you will). But you won't starve and you'll have your own apartment.
Worst case you'll have a blast and go home an experience richer.