Why were Che Guevara and the Cuban Revolution inspiring for the European Left?

For years, the European Left had been railing against the increasing power and dominance of the United States and her allies across the globe. It seemed to many that nothing could stop the seemingly inevitable spread of Western capitalism, especially in the developing world, where it was increasingly taking root in partnership with right-wing military juntas backed up by the United States.
The victory of the Communist revolution in Cuba appeared to put a halt to this process. Communist insurgents, led by Fidel Castro and Che Guevara among others, overthrew a US-backed far-right dictatorship which had been a reliable strategic ally to the United States for many years. To the European Left, the Cuban Revolution was an inspiring moment in world history, as it appeared to suggest that the onward march of Western liberal capitalism had been halted and that its future was no longer assured.
As capitalism was more advanced in Europe than in Cuba, it was widely believed by left-wing parties on the continent—especially those of a more orthodox Marxist bent—that there was every chance that a socialist uprising, similar to the one that had achieved such astonishing success in Cuba, would soon break out in the West.