Will be in Beijing day and a half in mid-November. Should we book a hotel at airport or in Beijing?

Will arrive at PEK at 5 p.m. on flight from US. Will have all of next day free. On the following day we depart
PEK at 5 p.m. Want to see the wall, not spend time on it and visit the forbidden city area. Will appreciate any thoughts about where to stay (airport or city) and how to use our time.