I love Slate Wine Bar. I often go in for Happy Hour and the bar is welcoming and the servers friendly. You'll probably meet Danny Lledó, the Chef & Sommelier who makes it a point to welcome almost everyone himself (when he's not busy behind the bar or in the kitchen). The HH specials are great, and they have one of the largest HH appetizer menus I've seen in DC. Overall, definitely make it a point to stop in!