Straightforward savings account would be okay, go into the bank and withdraw cash. Do banks have such a thing in Poland !
Trust me: you do not want to go into a bank and do anything: customer service in banks varies from disinterested to downright rude. You can be a member of the board of PKO BP and the staff at BKO BP will still treat you like ****.
I would very much recommend an account with Citibank: the automatic telephone banking is entirely in English (or Polish if you prefer), so is the internet banking, and they always have English-speaking staff available when you want to speak to a person (in ten years of using them I have never not been able speak to an English-speaking operator, no matter what time I call up). They also have special accounts in the UK for Poles marketed under the "Two countries - one bank" slogan. Would be nice to see Brits using the same accounts, then we can compare the service offered by Citibank in Poland and the UK.