Does every language get its own URL?
This is the one that matters most for being found. Google treats each URL as one page in one language. If the Portuguese version only exists after a script runs in the browser, Portuguese searchers won't find it. You want /pt-pt/ceramica-artesanal next to /handmade-ceramics, ideally with the address itself translated, not a ?lang=pt parameter.
What happens to the price when you write more?
Work out what your bill looks like after a year of posting, not on day one. Word-based pricing is fine for a five-page brochure site that never changes. It's a poor fit for anyone who blogs, adds case studies or publishes a seasonal menu, because the site grows and the price follows. A flat price makes the decision once.
Can you review a translation before it goes live?
Machine translation is good enough to start from and not good enough to publish unread. Names, prices, opening hours, idioms and your own tone of voice are where it slips. Look for a workflow where each translation is a draft you read and approve, in the same place you edit the original.
How much upkeep are you signing up for?
Count the systems: a host, a theme, a plugin, a translation service. Each one updates on its own schedule, and the compatibility between them becomes your job. One system means one place to look when something breaks.