What should be the best way to reach Comfort Inn & Suites Sanlitun, Beijing from Capital airport?

You are advised to take Airport Express train to Dongzhimen Station. Then, change to metro line 2 to Tuanjiehu Station, Exit D. Walk west for about 400 yards to the hotel.

You can buy the tickets by CNY cash. You can exchange your currency to CNY at many spots in PEK, including Travelex in Domestic Arrival Hall, F1, T1; ICE in International Arrival Luggage Hall, F2, T2; and ICE in the departure check-in hall,F4, T3-C. By the way, you can buy a transportation smart card and top it up at any metro stations. Have a nice trip! :)