So I send you all the information. When you arrive in front of number 62 rue de Lisbonne (large gray gate) you will see a small door (on the building's side) a few meters on the right. It's here ! B738 code. Past the long corridor (light on your left) you will arrive in a small courtyard where are the bins. Continue forward you will have a staircase that goes on your right (do not take) go straight. You enter the building and go up the small ten steps on your left. After having mounted, go to your left and it is the gate number 6 (down the hall to the left) the keys are in the small recess above the door. I do not know what size you are, but for me I am small, so there is a white walking feet for this purpose at the door. (A tuck the inside when you have collected the keys and opened the door.