Valet takes forever and a day to bring your car around. Like, 30-45 minutes. Completely ridiculous. The in-room automated valet system means nothing. Don't even bother. Just walk.
JW Marriott Washington, DC is nestled on Pennsylvania Avenue in the heart of the city's lively downtown district, a short walk from the White House and the many monuments and museums of the National Mall. Metro Center Metro station is close by as well.