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"Hell" is the default translation, and definitely the correct one here, in my opinion (just as it is, for example, in Dante).
"Inferno" in English should just be a fancy Italianate way of saying "hell", but seems to have acquired a connotation of literal heat and flames. (That is, it's as if people have forgotten that "the blazing inferno of a burning building" is a metaphor.) In any case, neither cultured fanciness nor literal flames are intended by Calvino in that passage, as far as I can tell.
I'm not sure prudishness is necessarily to blame; it may just be a case of that all-too-common translator syndrome of reaching for a word that looks like the original word, rather than the word that the author would have used if he or she were actually a native speaker of the language you're translating into.
Here's the passage in the original, for those interested (source):