I'm currently in the process of deciding where to go for my PhD studies (in Europe, i.e. I already have a masters, PhD is then just research). I wonder what are the criteria I should consider when making the decision? Of course active research in the area I want to study is in the first place, but what else? I guess having a lot of seminars/workshops/conferences is also a vital thing. Is there anything else I should look at when I make the decision?