From Centraal Station (central railway station) you can take tram number 4,9,16,24 or 25. Ask the tram driver for the stop called ‘Spui'. From there it’s a 5-minute walk to the Service & Informatiecentrum at Binnengasthuisstraat 9.
You can also take the metro (underground), get off at stop 'Stadhuis/Muziektheater'.