My choice in Asia would be Singapore due to its safety, cleanness and almost perfectly infrastructure.
In Europe Munich would be my first pick.
There are many other places where you have a nice life and certain life style. Unfortunately all these places come with a price. Singapore, Munich and a few others are no cheap places at all.
Nevertheless I feel unable to decide "this is the best city in the world".
Due to extensive travelling during all my live I am privileged to know many nice places, but I know them from a tourist point of view. And I don't know the entire place, just a few quarters of each of them. Despite the fact that I was living in some nice cities for a couple of years.
At the end of the day you have to decide what kind of life style you want to have. It depends on many things. Ig you have children, education is a point. Just to say.
By the way, Tirana, Albania, is a lovely city with wonderful people. It's a mixture of Italian and Greece life style, wheater is nice, it's very much affordable and you really can have a nice life. Was wotking in Albania for a couple of years and don't want to miss this experience.
And, last but not least, Dunaguete, The Philippines, is quiet a good spot. Provided you can handle some deficits and lack of infrastructure and education. But it's not bad.


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