I live very close to DCA, right across the street from a Metrorail station. I prefer DCA, but just remember, that you cannot exit your seat to use the lavratory 30minutes before landing at DCA or 30minutes after takeoff from DCA! Suposedly, the flight will divert to Dulles (IAD) if any passengers get up during that time. I have been on any number of flights where folks get up and fellow passengers or flight attendants instruct them to sit down--and the flight does not divert to IAD.

The no pee rule is the most annoying thing about DCA aside from the higher cost.