but dismissed it as being too americanocentric
Doubtful. I won't deny that there's an awful lot of, as you say, americanocentric, stuff on the Internet, but I don't buy that this counts, especially given that the author is (as best I can tell) in Norway. Also, in the US, "borough" is not a widespread concept. Only a few states use that term, and they use it for different things: in NY it's a subdivision of a city, in CT it's an incorporated community within a larger Town, and in AK it's basically equivalent to a county.