The most important feature is that the e-reader can display the pdf in landscape mode so it cuts the pdf in half and makes it big enough to read.
If you're confident about rooting, you could install a 3rd party Android reading app on a rooted e-reader like a Nook / Kobo / Shine. As you're in Europe, you could get an Onyx which comes already rooted.
Also from what I read, I think the kindles also have a good community-made tool for reading pdfs, but I you will have to jail-break the kindle.
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