Cafe XO, located in the hilly and vibrant neighborhood of Glen Park, is a really wonderful corner cafe that features everything you could ever want from a coffee shop. The staff is very friendly, the food is delicious (both the savory breakfasts as well as the wide array of buttery croissants, sugary cookies, and fruit-filled danishes), the coffee & espresso are decently priced (with free refills for drip coffees), and the atmosphere is cozy and welcoming. There are quite a few tables with plenty of electrical outlets lining the walls, making it a good place to hang out for a few hours doing work, and the staff doesn't bother you or peer at you with inquisitive or annoyed eyes. It's also an easy place to get in and get out, and many people are constantly filing through, grabbing a coffee to-go and addressing the staff on a first-name basis. For a cafe, it doesn't get much better than this one.