American in Barcelona here. Near the center of the city, in what is called the Eixample, where upper/middle-class live. Just block after block of oldish 19th century buildings, all attached and businesses sharing building space with residences (flats). Springtime brought us greenery for the streets, but it's very high trafficky, very noisy (I've never cursed scooters so much until I moved here. Why must they be so loud? Can't they make mufflers for that? People are trying to sleep sometimes!!!)
But I miss the greenery and open spaces of the American suburbs I grew up in. Here it's mostly sidewalks, and they're so crowded everyone is constantly in the way of someone else, and there is NO concept of personal space here: people WILL get all up in your business and make no effort to avoid you on the sidewalk, or accidentally elbow you due to lack of space sometimes. I hate that. Also, it makes it difficult to walk my dog. There is a nice grassy city park but it's about 10 blocks away and we don't make it out there as often.
Mostly I see a lot of seniors and middle aged people here. There are children, but it seems I only see them en masse when school is letting out, not after though.
The architecture is pretty, the city is chock-full of history and it's a beautiful and interesting place to visit, but not so much to live.