Transport from Beijing airport to Four Points Shereaton.

I am staying in Haidian Four points sheration. Nearest subway is Ba Gou Subway Stop. What is the best way to get from the airport to my hotel? Which shuttle bus should I take or which train should I take?
How much wl it cost by train, bus or taxi? How long wl it take by train, bus or taxi? Whats your advice? Thank you very much.