Ernest Achenbach
Google
A very cool watering hole with that lovely DC dive-bar charm, this place has a lot of character and more importantly, a happy hour drink and appetizers/small-to-medium bites menu that is fitting this Petworth haunt. If you're there at the happy, try the special punch for the week - it is a great start (and has a nice kick, so be careful!) to many interesting cocktail options. I nibbled on the Pork Sliders and BBQ wings, both of which were very good! The prices were totally reasonable, too.
There is a cozy library-lounge back room that seemed to be the hot spot when I was there on a generally non-eventful Wednesday evening. It filled up quickly, likely with those who are "in the know" of the spot. The bartenders were extremely nice and always around with great service. This is definitely a place I would check out again.