Are you looking at about 1,700zl for rent on say a flat that is 1,200 initially so,electricity, water, gas, etc then perhaps then another 1,000 zl on food?
Yes we will probably be looking at around 1700ZL pr. month atleast expect so.
Food pr. month you can do for 30ZL pr. day so yea IMO like 1000ZL pr. month would be good to have for food.
But to be honest if you'll get 3000NET that will leave you left with basically nothing, so consider if its worth it or atleast do all you can to get the 5000 Gross.