Leopold’s Kafe and Konditorei
Leopold’s Kafe and Konditorei, 3318 M Street NW, Washington, DC, 202-965-6005 (Metro Trip Planner - opens in new window) [Washingtonian | WaPo | City Paper | food-plan | Don Rockwell]
Might be OK for Georgetown. The specialty is pastries, they sometimes have Tafelspitz.