How to reach Beijing Capital Airport to Tiananmen Square Hotel Days Inn at midnight?

Do you refer to Days Inn Forbidden City? If yes, upon landing, you can take shuttle bus Xidan Night Line and get off at International Hotel first. The ticket fare is CNY 24 per person. The service hours of this bus line are from 00:00 to the last domestic flight arrival. After arriving, take a taxi to the destination. The cab fare is around CNY 15 at that time.