While the idea is great I'm not convinced that the Soviet Union is the best example to demonstrate the concept. Yes they had a "right for leisure", unless the State decided that you were a slave and sent you in Siberia to knock hard rocks for the rest of your life. Or your "rest days" were in fact forced, unpaid labor (subbotnik), no different than their previous feudal serf system.

Same for a "right to a house", where the State provided you with a filthy, overcrowded slum and call it a day.