• Guide in general
  http://www.kek.jp/intra-e/access/
  http://www.kek.jp/RSO/eng/
• From Narita airport to Tsukuba center
  http://www.kek.jp/RSO/guide/transportation/narita_jikokuhyo.html
• From Tsukuba center to KEK
  http://www.kek.jp/RSO/pdf/KEK_Center.pdf
  (see the upper box, green and white)
• From Tokyo to Tsukuba center / Tsukuba station
  by Highway bus (recommended for the first visitors)
  http://www.kek.jp/intra-e/access/timetable2.html
  by train
  http://www.kek.jp/intra-e/access/timetable4.html
  (use upper box, "Tsukuba Express")
  
  Railway map
  
  (Click an image for a larger view.)

Please get to the Tsukuba Center as the general guide in the above, then take a taxi to the hotel. The cost is around 3,000 yen.
The following will help you.


(Click an image for a larger view.)