Stayed here with wife and 2 children in December 2012- booked a family room with 2 double beds. On arrival, our room was not ready- but the extremely helpful front desk staff arranged a free upgrade to a junior suite- which was great. All the staff that we encountered- from the front desk to the concierge, the bell-men and restaurant staff were really good- friendly, efficient and helpful. The room was of a high standard, and the meals (we had 2 breakfasts and 2 lunches at the hotel)- were of great quality.
Location was perfect- very close to the White house, close to metro station and sight-seeing bus stop, and within walking distance of Washington monument and most Smithsonian museums. Chinatown is a mere 15 minute walk and has a variety of good restaurants (mostly not Chinese!)
In summary- this is a very high quality hotel, with well trained staff. It is obvious that they strive to maintain a high standard. In fact because of our experience at this hotel, I will try to use the Sofitel group wherever possible.