From all directions you can take the freeway surrounding Amsterdam, the “ring”, A-10. See roadmaps of Amsterdam.
You follow the “ring” either westbound or eastbound until exit S108 / Buitenveldert / Amstelveen / Centrum.
At the end of the exit, turn south, direction Amstelveen, and after 100 meters, turn left (south) to reach the hospital. You can also reach the hospital by following town route S108.