It has to have summer, that is, 3 months of heat, not summer like in the United Kingdom or other northern European countries that have 2 weeks.
I don’t mind a hard winter, I tolerate the cold. But summer is important.
Rent should not be too high.
I want to be from the European Union because I have the right to work in those countries.
That it has good salaries.
I am a dual US/EU citizen and this one of the reasons I have chosen to stay in Massachusetts, USA for now. If you work for a good company you get good benefits, a high salary, and lots more sun than Northern Europe. Plus, MA basically has universal healthcare.