2032 P Street, NW
Thanks to @barredindc for sending word. Cafe Japone was located at 2032 P Street, NW. Barred in DC writes that they closed in late September/early October. The DC Alcohol Beverage Control Board canceled their liquor license on October 9th:
cafe-japone-cancellation-of-license-10-9-2013
Though their phone has been disconnected you can still see their menu here (as of this morning.) Stay tuned to see who takes over the space.