The Cuban government views the abstention by the US as a victory. It has spent decades arguing against the economic embargo (or the "blockade" as Cuba call it), saying it is a cruel and unjust policy designed to hurt ordinary Cubans.
While this vote doesn't have any weight in actually lifting the measure - that depends on the US Congress - it is important symbolically. It is a final message from President Obama that his administration considers the policy to be outdated and counterproductive.