You asked about DC lodging with cooking facilities:

Washington Suites on Pennsylvania and 25th St. has full kitchens and is in a convenient location. I haven't stayed there myself, but plan to on my next trip. It looks nice from the outside. http://www.washingtonsuitesgeorgetown.com/

Embassy Suites near Dupont Circle has limited cooking facilities and is about 4 blocks from the Metro in a mixed residential - commercial neighborhood.

Carol in Boulder Colorado