From the railway station
Take the tram 15 in the direction of "Nations". Those are in front of the train station. Get off two stops further. The stop name is "Butini". Walk back for two blocks and you will find Rothschild Street on your left. We are on this street.
The trip costs CHF 2.50 (short trip ticket, 3 stops maximum)
Follow Lausanne Street during 10-12 minutes and you will find Rothschild Street on your right. We are on the left side of this street.