The easiest way is to take a train to Den Haag Central Station and catch a tram from there.
The following trams stop right in front of our door, Brouwersgracht is the name of the stop.
Tram 2 : Direction Kraayenstein.
Tram 3 : Direction Den Haag Loosduinen.
Tram 4 : Direction Den Haag de Uithof.
Tram 6 : Direction Leyenburg.
It's the 3rd stop from central station ; BROUWERSGRACHT.
Did you arrive at the HS station, Take tram 1 towards Scheveningen and transfer to one of the lines above at the Spui stop. Or you can walk, it's about 15 minutes.