Adress: LSCE, CEA-Orme des Merisiers, 91190 Gif-sur-Yvette, France
https://www.google.com/maps/d/embed?mid=1X4CcIQLjJWY-nV42JUo6ZTcPpj_NR2cV
RER B to Massy-Palaiseau, then bus 91.06 (direction Christ de Saclay/St-Quentin), bus stop "Orme des Merisiers" (~ 25 min. of bus ride).
https://www.vianavigo.com/accueil
Here a map to find the 91.06 bus stop at Massy-Palaiseau:
RER B to La Hacquinière