How much should I ask for a junior position in HR in Krakow ?

I have been contacted recently for a Junior position in HR in Krakow from an International Company (American). They look for people speaking specific languages in addition to English in my case French.

nb : I have a master in HR and about 1 year of experience in that field.

They want to know my salary expectation but I have no clue what's the life like in 2018 in Krakow. I read that Krakow is an expensive Polish city. I was thinking about a gross salary of 5500 PLN to get at least something near 4000 PLN net. Is that too much ? should I ask more ? Plus, I would expect to live in the city center in a small flat.

Thank you for the advices !! :D

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