I have read that there is a lot of "make do" with those ancient cars, such as a fork lift engine in a Cadillac.
Some of them have Russian tractor engines in them, so they sound like a tractor. I know, I was there. It's been legal for Canadians to visit.
I'll say right off, it's not a society I would choose to live in. I wouldn't feel I fit in there. But it's not a simple situation, and I'd say there were some interesting things about it. For one, after the Soviet Union collapsed, and was no longer buying the huge excess Cuban sugar crop, the Cuban economy (meaning jobs & income for Cubans) suffered drastically. Government employment diminished and work was deregulated considerably. That meant more neighbor helping neighbor, and more 'necessity being the mother of invention' (more independent creativity).
The Cuban people are friendly, they love music & dancing (and are good at it), and they love baseball & soccer. The architecture, for instance of apartment buildings, improved after Soviet influence ended. After the Batista days, the literacy rate rose dramatically. And I saw a lot of books around, reflecting many subject areas, and from cultures & nations around the world. It's well known Cubans get good health care.
We were able to travel where we wanted, though the buses aren't the most modern or most comfortable. I felt there was too much supervision by policemen, keeping some sorts of interactions on the streets of Havana, between citizens & visitors, acceptable. A taxi is supposed to be licensed as such, but we were able to ride in an unauthorized one at one point because we were inconspicuous when hiring the guy. We were able to have a very frank conversation over several days on a beach near our hotel with one youngish guy whose profession was teaching French & English — "brainwashing" hadn't tainted this fellow's mind at all.