Most up to date public transportation routes —> IN HERE
On the website, press little arrow to adjust departure time !
From Central Railway Station ("Warszawa Centralna") you can take a tram 10, 17, 33, 41, or bus 109, 160 (goes every 5 minutes and has a nice route),
174, 518, or a cab (ask for the price first, it should be less than ~20
zlotys (~5€)). You can also walk - it's only 12 minutes!