Even though Poland is a member of the EU, they do not use the Euro, but still use their own currency, the Polish Zloty.
Tip! Poland is a more cash oriented country than Sweden. Some stores only accept cash payments, but most hotels and restaurants accept card payments as well. ATM availablity is mainly concentrated to cities.
Delivery to nearest post agent
Save the receipt and change back for free
Buy currency in advance, no need to search for ATMs
Restaurant: 10%, Taxi: Round up