I read 3 books from Hannah Arendt and I trust her historic analysis because it correlates with what I read from thinkers pre-cold war, such as Otto Rank for example. And because she presents a lot of sources in the "Origins of Totalitarianism".
But many people say we can not trust her historical analysis because she was a revisionist financed by the CIA during the cold war. And to confirm it people suggest the reading of "Who Paid the Papers'' by Frances Stonor Saunders and some works from Losurdo. But by reading the reviews I found many people pointing at historical lacunes and foolish information errors in "Who Paid the Papers", convincing me it is not a reliable source. And Losurdo is known for being a blind passionate supporter of Stalin, so he seems not the right person to look for confirmation about Hannah Arendt historical Analysis fallacies or cold war propaganda.
Apart from that, I have read a couple of books from David Harvey but the few times he mentions Hannah Arendt historical analysis he agrees with her.
So, how much can we trust Hannah Arendt Historical Analysis?
The long and short is that Arendt's historic analysis is not good to bad, as laid out here by u/commiespaceinvader. However, this has more to do with Arendt's conclusions being at odds with historic consensus, than any possible affiliations with the CIA.