We have friends coming into town this weekend and we want to meet them in DC for breakfast on Sunday AM (9:00ish). They are stayin at the St. Regis and won't have a car, so it needs to be walking distance for them or metro accessible. There will also be 3 toddlers, so a kid-friendly place is important too. Any recs? Now that I have been living the 'burbs for 3 years, I never to go into the city and am totally out of the loop.