Both are proper and fine. However, if I were saying that sentence, I would probably say "Living in Japan is comfortable."
18 luglio 2014
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Both sentences are fine.
While the second sentence is more general, the first one could also be referring to a living creature (The "it").
18 luglio 2014
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Both are ok.
comfortable + gerund
and
comfortable + [full infinitive]
are both OK in your example. But this isn't always true of adjective + gerund/[full infinitive]
18 luglio 2014
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