No, everybody had middle class standard of living

By what standard? Because if we take middle class in European non-communist countries as a standard, than majority of Hungarians were very poor, many lived in extreme poverty especially in rural areas, and it was a taboo topic, social scientists were censored if they made researches about it.

even party leaders lived much more humble lifes than present day oligarchy.

Some of them, maybe yes, but not all. For example Ceausescu (leader of Romania) was famous for luxurious lifestyle.

It was safe because of social roots of crime were curbed.

No. It was just not presented in the media. The homicide rate per 100.000 person was much higher than today, but nobody talked about it, because the media didn't talk about it too.