This museum is small. Most people won't spend more than 1 hour in this museum.

Very illuminating for those born after 1989.

Me and my missus love a bit of history, and we’re both ‘cold-war kids’, so we were fascinated to have a look at the ‘life under communism’ museum, and get a glimpse of what life was like for ordinary Poles.
The museum is easy to find, and the ticket prices are fairly cheap, but hiring the gloriously camp ‘walkman cassette player’ audio guide bumps the price up a fair bit. The guide isn’t really necessary to be honest, but it’s totally 80s fun!
The museum gives an overview of how Poland came to be ruled by the Russian influenced Communist regime, and how this affected all aspects of the lives of Polish people. There are recreations of a communist official’s office, a worker’s flat, a little cinema showing Soviet public information and propaganda films, and many examples of Communist-era consumer products, fashions, and art.
It’s a small museum, but there is lots to look at, admittedly it’s probably of interest mostly to Poles or fellow Europeans who grew up under communist regimes during the cold-war, but we found it fascinating as fellow cold-war kids from the capitalist west.
I’d recommend a visit to the museum if you’re at all interested in post-war history.