By Train: From the railway station of  Geneva-Cornavin take Bus Line number 9 direction BEL-AIR till the terminus (aprox. 20 min), than walk through the park of Belle-Idée for 3-4 min.
See the enlargement of the map below.

By Plane: From the Geneva-Airport you can reach the Lab taking Bus Line number 9 direction BEL-AIR till the terminus (aprox. 45 min).