I assume most universities would have their own in-house printing facilities; at least mine did, and handled my PhD thesis as a matter of course without me spending a cent. (edit: It may have been taken on some project's budget or something... I don't remember...)Otherwise, I would look for shops near Sorbonne, because students have to print their university thesis somewhere.
I don't recall how it was for master's and internship reports (which are much simpler/smaller print jobs anyway), but the idea of students having to hunt for shops and pay out of pocket for non-trivial printing required by a university course / diploma strikes me as wrong, even possibly against regulations. Where I am now, I'm quite sure we print students' reports if requested to do so (though some may find it simpler to print themselves).
So it's not clear to me that "proximity of university" implies "printing shops open to the public". And If Le Pertti needs this as part of a course (in a public établissement d'enseignement supérieur), the first step is to ask the ones responsible if they can handle the printing.