On two separate occasions I've had the good fortune to visit friends in Barcelona who lived in this part of the city. From my limited experience and as a very picky person, I have to say this city works very well, it is a vibrant and safe place to be. I love Barcelona.
These are Barcelona's superblocks, and they are really cool, actually.
They're walkable, mixed zoning spaces. The lack of cars means people are free to lounge and hang out in the community space in the middle, which does a lot for the alienation and loneliness modern people are increasingly feeling. Here (image) you can see people playing and being around each other. I think you can see some shops in the background, too.
I'm sure I would want to know a little bit more than I do, but I would love to live in one of these.