If your requirement is the EU (and not merely Europe) ... I've heard the best things about the Nordic countries (especially Sweden) and Cyprus Switzerland isn'

If your requirement is the EU (and not merely Europe) ... I've heard the best things about the Nordic countries (especially Sweden) and Cyprus Switzerland isn't a member of the EU (https://www.schengenvisainfo.com/countries-in-europe/eu-countries/ https://www.schengenvisainfo.com/countries-in-europe/eu-coun...) - but the folks I' know who've lived there liked it (minus cost of living) I've also heard good things about Iceland - but, again, they're not an EU member nation