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Personally, I don't really like Alfa which is quite popular here.Bios and Z are much better in my opinion.Any good Croatian beers you suggest?

Depends of the style of beer you prefer, if you get in a bar which doesn't offer crafts I would go with Tomislav or Grička Kraljica. If you are looking for a good craft, anything from The Garden Brewery will do and you won't go wrong with Varionica or Zmajska Brewery either. :)