LPENS is located at 24, rue Lhomond (blue circle in the middle of the map)
Nearest Metro station is place Monge on line 13 (white M in red circle right to LPENS on map).
On the RER-B line get off at Luxembourg (jardin de Luxembourg is the green area to the left of the map, the station is the RER in white circle next to it).
When you enter the building at 24, rue Lhomond, take the glass elevator to the second floor and go left, and then right. Alternatively, take the black elevator in the entrance hall, botton 4, and then proceed straight. You will enter our corridor which is painted in orange. My office is E231.