I've moved around a lot. Some of the places I've enjoyed living in:
London / Bristol, UK
Edinburgh, UK
Darjeeling, IN
Utrecht, NL (lived in Rottedam too, wasn't much of a fan of that)
Freiburg / Stuttgart, DE (notably high quality of life here)
Hong Kong, HK
Fujisawa / Enoshima , JP
Montreal, CA
New York, USA
Some of those places have changed greatly since I departed. HK is a very different place now to how it was in 1998. Enoshima was a very nice place to live in Japan, quite different from Tokyo or Yokohama.
London was a great city to live in (still have family there), always something going on. It's too pricey now to live centrally though. Edinburgh is a great place, and the west coast of Scotland in general is pretty stunning.
I grew up in India, split between Tamil-Nadu and Western Sikkim, both spectacular places. Germany was probably one of the most 'sorted' places, with the highest quality of life for it's citizens.
Oman ranks pretty high in the 'nice places to visit' list. As does Madagascar and oddly New Zealand. I was on UN deployment in Kinshasa years ago - aside from all the shit going down, it was a stunningly beautiful country as was Senegal.
I've rarely been to the USA or it's territories, only camps in S.Korea and Okinawa. Will be visiting soon though. Can't imagine it's very different from big Canadian Cities (Toronto etc.)