The workload was discussed earlier this year already:
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www.mysteryshopforum.com]
It's a US based company and the hotel staff are expected to speak English with guests. I have done plenty of assignments outside of the U.S. and had less trouble in countries where I did not speak the language than ones where I did, but not well. I highly recommend conducting all evaluations in English unless it's requested otherwise, or you are fully conversant in the other language.
The hardest part for my upcoming assignments outside of the US will be remembering to use metric for the measurements.
BTW, the whole "No narrative" thing is not entirely true either. There's an add-on component for this year that requires a standard Coyle style check-in narrative. It wasn't in the instructions but there's a question on the extra form that simply says, "Provide a detailed narrative of the check-in experience."