Ireland is probably the friendliest I’ve been too. The Irish are great people.

Rome (I know, not a country, but I can’t comment on the rest of Italy) is probably the least friendly place I’ve been to. Romans are assholes. It’s a very cool city, but the people, especially outside of tourist traps suck.

The Japanese are very polite, respectful, and helpful (almost to a fault) but I’m not sure if I’d generally describe them as friendly.