Thanks so much for all your help. I finally got a room at the Rennaissance M St for $135/night. It's actually 3*. Their website quote $350 or so. I searched in Foggy Bottom, Dupont Circle, Downtown and White House areas. I tried many, many cheaper options, this was the first that worked. :) I'm still jealous of all the reported $75 rooms listed, but since this is mid week through weekend, I'm pretty happy.