Life / Cost of living in Warsaw, is 4.000 EUR a month OK? [9]

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Costs of living in Warsaw

I'm interested in costs of linving in Warsaw
1) public transport
2) car costs (if I bring my car to Poland) - fuel, insurance, what else?
3) equiped accomodation rental (including household appliances)
4) food costs - ~ monthly, inclunding lunch
5) ?