In a few weeks, a brand new subway line will open, connecting the northern part of the city (across the IJ river), Centraal Station, and other stations near Spui, Leidseplein/Museumplein, de Pijp and Amsterdam Zuid train station.
This means that not only travel times from hotels located across the river or in the modern Zuidas area will be slashed, but also that widespread changes to the tram and bus network are coming.
For instance, the combination of train from Schiphol to Amsterdam Zuid and subway will be much better than bus 197 for those staying in Southern neighborhoods.
Indications of tram routes on hotel sites, guidebooks and this forum are most likely to become outdated.
So if you are traveling after that date, use the best source of information for public transportation in Netherlands, the website (and app) www.9292.nl
Also, bear in mind many hotels opening for business soon outside traditional areas.