It will be cold in Beijing that you'd better wear warm winter clothes. Please refer to the real-time Beijing Weather(https://www.travelchinaguide.com/climate/beijing.htm) on this website.

From Airpot to the hotel: please go to take shuttle bus Line 2 (CNY16) to its terminal at Xidan firstly. Here, you could transfer to subway Line 1 (CNY2) to Bajiao Amusement Park station. The hotel is located in walking-distance.