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Here is some information from
https://coinatmradar.com/countries/ and my comments.
First, I live is a city in the SE USA, and there are several BTC machines scattered about the city. Two years ago there were very few. AT first the premium to buy was some 9% over BTC price "spot", which seemed reasonable. Now there are several more machines (and more reliable), but the premiums range from 14% - 19%, ouch!
I once used a machine in NYC years ago, with a premium of around 10%, but did not require ID! I am sure that's changed...
In Vancouver (Canada) I used what is purported to be the "First BTC ATM" at a coffee shop (2016), no ID needed, about 10%.
We will be going to Italy this summer. According to coinatmradar above, there are two machines (total) in cities that we will visit, one shows a premium of 8% the other machine did not post their premium.
We may be going to London as well. coinatmradar reports several machines in London charging only 6% over "spot".
https://coinatmradar.com/ <---- highly recommended!