We just got back the Forth of July week from the Manderin. It was a beautiful hotel. Very upscale and new. Gorgeous lobby, clean, large rooms, and all marble bathroom. We paid extra cash for a water view because we were told it had more square feet. They can bring in a cot for a family of 5. It was $40.00 per day. Seemed steep to me so we brought an aero bed and it fit fine.
It is a bit off the beaten path (maybe 4 city blocks from the Mall /6 blocks to the business district and restaurants. ) but the location was so quiet. It was up on a hill by itself, in a cul de sac on the river and views of the Washington Monument. No traffic what so ever. It was worth the extra walk. BTW put your walking shoes on. We felt we walked more there than Disney if you can believe it.
They have 2 restaurants. We didn't eat at either but did snack at the lounge. It was ok. They had salads, and sushi and cocktails. Nice atmosphere.
Also, if you are Coke or Pepsi drinkers, bring a case or two with you. We were a bit of a captive audience up on the hill we had get it a the bar. A very small bottle (8 oz) was $4.50 , no refills.
Parking was also $40.00 a day.
Any other questions let me know!