WASHINGTON - The best room in the four-dude D.C. group house is also the most isolated - up on the third floor, with pine-tree wall art, big windows and its own bathroom and shower. It belongs to Dutch Seitz. But if our current national nightmare infiltrates their home, the 26-year-old is prepared to move a few of his possessions to a small, spare room with an air mattress, allowing his coveted third-floor spot to become the infirmary.