Thinking they'll be coming up 295 and you'll be coming in on 50, so Cheverly is probably the place but I don't know that area. Off 495 I'm not sure either. Largo?
I'm in DC, and I'd think Zeke's Coffee or Emma's Torch on Rhode Island Ave NE for breakfast or coffee or Pennyroyal Station in Mt. Rainier for weekend brunch could work.