how easy is it to find a good wifi connection? Are there lots of cafes, etc. that offer it (even paid)?
There is a list of hotspots in Gdańsk.
tinyurl/ybtvhxy
dostęp płatny = paid
dostęp bezpłatny = for free
brak danych o odpłatności = unknown
Majority is paid. I think it will be hard to find reliable wifi for free.
You can buy Era gsm TAK TAK prepaid simcard and use your mobile phone as a modem.
price is 50zł pcm and 500 MB limit. Better than nothing :/