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Moving to Poland in 3 weeks to study! [30]
Euros would go farther than dollars, but a thousand is enough to live on.
Poznan traditionally has about the worst night life in Poland for foreigners of any major city (but studying medicine you won't have so much time for that). Traditionally Poznanians had active social lives but visiting each other at home, not going out together. This has changed a lot in recent years but it's still not Warsaw.
Poznan is a very safe city for its size. Polish people are mostly friendly to visiting foreigners but the longer you're here the more you're expected to conform to local norms. Poznanians also have a reputation for being stand-offish (by Polish standards).
The younger and better educated the person the more likely they can carry on a conversation in something approaching English. But despite what anyone might tell you ahead of time, you really do need to learn Polish while here. Not least because IME Polish people aren't as smart or interesting or fun in English as they are in Polish.
The climate in Poznan is north central european, generally not much snow in winter but it can get pretty cold (though it rarely gets below -5 the coldest I've ever experienced was about -20 but that's very rare). Summers can be hot and muggy (overall not so bad this year). Air-pressure changes a lot and can have a bad effect on how you feel (the worst is a sudden drop in air pressure which can lead to horrible headaches in a large percentage of the people here, including me).
21 single guy from Norway? You won't have any trouble meeting Polish women (added bonus, if a Polish woman is interested in you but you're too slow, then she'll make the first move). Assuming that like most wesern guys here, you'll end up with a serious girlfriend, don't necessarily settle for the first Polish girl you meet or be so picky that none can meet your standards. Also realize that Polish women are used to making a lot of the decisions in relationships that you might like to make yourself (like how many beers you can have at a party , how to dress and how to budget your money - let her, she'll usually make better decisions than you would).
Polish students at the medical university (and international students who attend classes with them) are not necessarily fond of the students in the English-language program as they get preferential treatment in a lot of ways.