I first tried La Colombe coffee while passing through Philadelphia and instantly loved it. They have a few locations on the East Coast plus a couple more in South Korea. The D.C. location is on a quiet alley in the Logan Circle neighborhood. When the weather is nice they completely open up one wall and it's amazing.
You can bring your pooch (a big plus for me) too! There is no menu which means you can order just about any type of coffee drink you want. Their almond croissants one of the best things I've eaten in a long time.
LA COLOMBE COFFEE Blagden Alley 924 N St NW, Washington, DC 20001