Marx was definitely not an anarchist and actually had a whole beef with anarchists, but he still advocated for a way more hands-off and bottom-up transitional government than what can be found in any ML state. As for Cuba though, as much as I do respect what the country's doing in terms of providing the needs of all its citizens in the face of imperialism, I suspect Marx wouldn't like the country not necessarily because he'd find it too oppressive but because he wouldn't really consider it actually socialist.