It costs 10-20 minutes for you to walk from Beijing Railway Station to the hotel. If the luggage is not too heavy to handle, you can try to walk. Not very difficult. Walk west along the Beijingzhan Xi Jie (west road of Beijing Railway station) and turn north (right) to Youtong Street, and you can see the hotel soon. Take airport Bus Line 3 at Beijing Railway Station. There is no hotel bus to the airport I think.