Yes, they are friendly. It's part of the culture since ancient times -- xenophilos I believe they call it.
It came from the ancient religion, where the Gods would impersonate humans and stay at lodgings. If people were inhospitable, the Gods would curse them.
I forgot to mention though, there are those that are hostile but mainly just in the way of anarchist / commie / antifacist politics, which seems to be fairly common based on how much graffiti I saw (then again, it could just be a loud minority.) You'll see stuff like "immigrants welcome, tourists fuck off" and anti airbnb graffiti. But it's harmless, and didn't detect any of it when talking with real people.
It came from the ancient religion, where the Gods would impersonate humans and stay at lodgings. If people were inhospitable, the Gods would curse them.