Capitol Hill is an outstanding neighborhood. It's historic, charming, and ideally located at the absolute geographic center of DC. Terrific safety, with the US Capitol police patrolling the area. Home to many politicians, media figures, etc.
Corner groceries, pharmacy, great diner and dry cleaners a two minute walk away.
Eastern Market (farmers market and baker/butcher etc) is a few blocks away. Amazing restaurants and lively bars within blocks!
Whole Foods and several other supermarkets in the neighborhood.