Aside from getting a taxi from Beijing Sunrise Youth Hostel Beihai Branch, Xicheng District,

Instead of cab, upon landing, you are advised to take the airport express to get to Dongzhimen Station first. It takes around half and hour. And the ticket fare is CNY 25 per person. Then transfer to metro line 2 to Xizhimen Station and line 4 to Xisi Station, Exit B. The duration is about 20 mins. And it costs CNY 4 per person. Afterwards, walk northeast around 750 yards to find the hotel.