As
Kawasaki indicates, it all depends what's important to you, the individual. Scanning my own memory banks, of the places I've hung my hat (and they have been a fair number), I would have to say that (for me) Al-Baha, in the mountainous part of Saudi Arabia, is the place I would most like to return to and live at. Of course, there's zero chance of that happening now, unfortunately. By this time they've probably even got internet access, I should imagine. Thinking about it, Muscat would run a close second.
I also have a high regard for anywhere in
Deutschland, but as far as the the UK is concerned, (as I say) it doesn't seem to matter too much. But Durham, Chester, Lincoln, Gloucester, York, Harrogate
etc. are all "nice".
The worst I have known? Well apart from Armagh in Northern Ireland during the so-called "troubles", I suppose (if I'm to be honest) I am bound to say Lagos. Followed closely by Edmonton in North London!
I've never been to Singapore, Roger. But if it's anything like the Hong Kong that I knew in the mid-1970's, I doubt that I would enjoy being there for more than a couple of weeks!