How to get to Beijing Redwall Hotel from airport by train, bus and taxi?

Well, this hotel is located close to the north gate of the Forbidden City, no direct transportation connecting to Beijing Capital Airport. Here are some suggested methods:
1. from the airport, take the Airport Express train to its terminal at Dongzhimen station and then take a taxi to the hotel directly. This will take you about 50 minutes in total.
2. from the airport, take the shuttle bus Line 2 to its terminus at Xidan. Here, you could transfer to No.109 of Beijing bus or a taxi to the hotel. It will take you around 1~1.5 hours.
Ps: the bus stop is called West Shatan Intersection.