For most people in the hotel they will only be aware that "it works". It "works" in the way that is most convenient to each guest. You'll hear things in the language you are most comfortable with, and accents will be "translated" into something equivalent in your language.
The thing is that the translation magic also makes it so people don't notice its hiccups. It is similar to the charms in this way, in the sense that it very slightly impairs your capacity to even perceive that it's happening.
If you are very aware like Asterion, however, you can notice its hiccups here and there.