Alas, no, not yet -- I've mostly gone there to indulge in decadent hot chocolate, and grab some chocolate bars to take home. There is a TON of stuff to do in that Logan Circle/U Street/Dupont Circle area, though, all Metro-able and pedestrian-friendly, so if you want to make a trip for macarons just pick a day where you have free time and the weather forecast is good, and wander around lots afterwards?

(Those were my primary stomping grounds when I lived in the city, as I was initially at 9th and O and then later at 9th and U, so I head out there periodically to visit old favorites and grumble about all the cool new stuff that went in after I was no longer living in the neighborhood.)