A large group of us stayed at Residence Inn's 2 bedroom suite. It was more than ideal for 6 per room, with a spacious living area and 2 bedrooms with 2 separate bathrooms. Beds were comfortable and the room was clean. Staff were attentive and helpful.
Location wise, it's excellent - walking distance to the Metro and many sights including the Smithsonian. Overall, this was a great, comfortable stay!