May I know what airport shuttle bus line will I take to Beijing Marriott City Wall Hotel?

It's suggested to take shuttle bus line 3 to get to the Main Railway Station. The ticket fare is CNY 24 per person. Then walk east around 500 yards.

Or from the airport, you can take Airport Express to get to Dongzhimen Station first. The ticket fare is CNY 20 per person. And the duration is about half an hour. Then transfer to subway line 2 to Jianguomen Station, Exit C. Afterwards, walk southwest around 0.6 mile to find the hotel.

You can choose the way you like.