You have probably been lucky to live in either Stalinkas or buildings built before the revolution. Buildings built before the revolution were mostly constructed for nobility therefore of a very good quality. Building build during the Stalin era(stalinkas) were also of the superior quality(and still are highly valued at Russia's housing market). Stalin's idea was that working class is a new nobility and therefore should live as the nobility. However construction rates were so slow, that by the time Kruschev came to power people were still living in wooden barracks sharing them between multiple families. Kruschevkas were never intended to be permanent housing, but rather temporary solution for the housing problem. It was intended to replace them with better quality housing once all Soviets had roof over their head. Which unfortunately never happened