Sadie Pixie
Google
You can buy tickets at the entrance on a card machine and choose a language and tour, we got lucky as the next tour in English departed 10 minutes after we arrived.
Went on a very interesting tour led by an English speaking tour guide. It starts with a film and safety briefing. I found the tour was a little expensive just for an hour, and it felt very fast hence the 4/5 rating - no fault of the guide as it was a lot of ground to cover, but a 75-90 minute tour might give more time to absorb what is being shown.
I went here after visiting the National Museum and the Buda Castle Museum, and this museum was honestly the most effective in showing how the war and post-war period impacted Budapest and its citizens.
The tour had a very poignant anti-war message and I would recommend to anyone interested in WW2 medicine, WW2 generally, or the Cold War (and also, if it is a warm day, it is a good place to escape the sun!)