LPT-ENS 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 LPT-ENS 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).
You can also walk from Port Royal on RER-B line (Hotel Sunny is located there).
When you enter the building at 24, rue Lhomond, take the elevator to the second floor and go left. You will enter the corridor of our lab LPT-ENS. My office is Dc12 further down the corridor.