If you arrive from Schiphol airport you can take bus 197 directly to the Leidseplein. The bus stop is 200 meters away from the hotel (costs: circa € 5.00).
You could also take one of the trains (at least every 15 minutes) to the Central Station of Amsterdam. Then see arrival by train. (costs: circa € 3.80 plus tram €2.70)
Or you could take a taxi. Please tell the taxidriver to go the Leidse Plein, as the Marnixstraat is very long and he might drive you to the other end of the street first.
To be sure you have a good price you can book a Green Electric Taxi ahead now from the airport to La Bohème (max €40,-). Free Wi-Fi inside and you can pay the ride also with creditcard.
Zero Emission Taxi Services