Marc's place was totally comfortable, convenient, and a super value for attending a conference in DC. It's situated in a well-kept, historic, beautiful, and safe neighborhood. I enjoyed walking to my conference at the convention center everyday and also walked further to the Mall. I never tried the bus, but routes are nearby. There are several great restaurants and coffee shops in the area.
I had a few questions and Marc was quick to respond. He provided a parking pass and parking was available on the street in the front of the apartment, or close by.
I would definitely stay there again.