JFK lived in nine different Georgetown homes during his time in DC and spent his Sunday mornings at Martin's Tavern, where he also proposed to Jackie in Booth 3 (to this day the restaurant still gets requests for that booth for people who want to propose). You can see all of these locations on a self-guided walking tour that takes about ninety minutes (none of the homes are open to the public, so observe from the curb, but Martin's Tavern is still very much a thriving restaurant). Click through the link for a slideshow of the homes, the church he frequented, and a video of the famous seats at Martin's Tavern.
· JFK's Georgetown/Video interview with manager of Martin's Tavern [Gadling]