"Located downtown on Connecticut Avenue between L and M Streets, this AAA 4 Diamond, Mobil 4 Star Hotel is just four blocks from the White House and a short walk to museums, national monuments, restaurants and business and shopping districts. Washington National Airport is 15 minutes away, Dulles International Airport and Baltimore/Washington Airport are both within a 45-minute drive. The hotel is located just one half block from the metro station (subway system)."
They have a very comprehensive hotel web page , which includes a Quicktime tour of the facility! It is really a very beautiful place and the conference committee is very pleased to be holding CEC99 there.
The negotiated rate is $125 per night for single, double, triple or quad.
Please mention CEC99 when you register to get the negotiated discount.