Is Oslo a fairly english-fluent city?

Answer 1

Yes, as the capital city and getting a lot of tourists in summer, most Norwegians in Oslo are usually good at conversing in English.

In Norway, with a population of only 4.5 million, speaking a "mainline" language well is important, and English lessons start in the early grades.

Answer 2

Most northern European cities are very fluent English speakers. Shame native English speakers aren't half as good at making the effort to speak other languages.

Answer 3

Norwegians are among the best non-native English speakers in Europe (along with the Dutch).