Most of my neighbours just say hi when we pass each other in the stairwell, really. It's rare that we ever see any more of them than that. There is one couple that we're somewhat close to, though - the ones in the flat just up the flight of stairs that starts at our flat door. I met them while getting locked out years ago during a rough time in my relationship with Danielle in which she stayed elsewehere for a week or so. I was sitting outside on the kerb waiting for a locksmith to arrive when the girl/lady (20-something at a guess) from upstairs invited me in to her place while I wait, she was pretty insistent. So we just talked about what was going on and yeah. The rough patch ended shortly after and Danielle and I are both good friends with her now, and her husband is pretty cool too. When we're out overnight then she feeds our cat, she has our spare keys in case we make the same stupid mistake (has happened once or twice xD), stuff like that. When I got Danielle some flowers and they turned out to be toxic for cats, we handed them to our neighbour instead and Danielle just went up to see them once the flowers were fully bloomed. Suddenly, a few days later, we had a knock on our door and she'd bought us some fancy flowers that were cat-friendly! Lovely couple.

When living in NZ, I have to say neighbours there are much more polarising. In the UK, they rarely say anything to anyone. In NZ, they're either the noisy/drunk/unfriendly types or they're really friendly and you'll probably be having barbeques with them on a regular occasion. Or at least, that's how it was where I lived. Luckily there were loads of the friendly kind in my life and I haven't personally experienced the unfriendly type.