Chun Hui Yuan resort and hot springs. This hotel is 25 min cab ride from Beijing PEK airport.

http://chunhuiyuan.hotelsinbeijing.com/

https://www.tripadvisor.com/Hotel_Rev...

Website says they have free airport shuttle, but the front desk speaks limited English, although they put in a lot of effort to understand and communicate, over the phone is difficult.
We were on a tour, so most of the day we were out exploring Beijing, so this video mostly features the resort at night.
If you have questions feel free to ask in the comments.