The problem is the cities citizens. Northern European cities such as Copenhagen are pretty quiet, despite their high density.
A lot of the character of a city does come from how its citizens imagine it's supposed to be. In the nicer parts of Stuttgart in 2000: Never once even the smell of garbage.
Paris is a Northern European town I think and it’s a disaster in terms of noise. Those damned 2 cycle scooters for instance. And dog poop and trash and people pissing wherever they feel like. And it’s expensive. Paris is an overrated nightmare.
Paris feels much more like a western European city, and France is definitely not considered northern European, at least if northern European is a synonym for Scandanavian.
Also thanks for adding data to this discussion, I am surprised Copenhagen ranks so low. But the neighborhoods I'm familiar with (Nørrebro, Vesterbro and Frederiksberg) definitely feel more dense than your typical North American city. The majority of housing is mid-rise, with lots of street-level retail.
That's a very shortsighted view. One can do an examination of world history and geography to strongly support the conclusion that commerce and cultural interchange has a tremendous amplifying effect on the strength of culture and the value of human capital.
Japan itself is an example of this on a smaller scale. When Europeans first got to travel in Japan, they marveled at the sheer volume of commerce they saw.
If cultural evolution is anything like genetic algorithms, then what's needed for optimal progression is a balance of interchange and continuity: multiple populations with some degree of interchange.
A lot of the character of a city does come from how its citizens imagine it's supposed to be. In the nicer parts of Stuttgart in 2000: Never once even the smell of garbage.