Meet your guide at the Arc du Carrousel, a large arch with a horse-drawn chariot on top. It is located across the road from the Louvre's courtyard. Turn your back on the glass Pyramid and you will see it across the road, just past the roundabout. Metro station : Palais Royal-Musée du Louvre (lines 1 and 7).
Your tour will end inside the Louvre Museum
You can cancel up to 24 hours in advance of the experience for a full refund.
Although it was not a hot day (late September), the Louvre inside was hot and humid, so wear layers so you won't get too overheated.
I also recommend you take the tour first thing in the morning so as to get in and out of the Mona Lisa without the hordes of visitors that accumulate throughout the day.