This one is a Jewel!
I stayed at The Joule for four nights while attending a recent trade show. From check-in to check-out, the staff was courteous, friendly and helpful. The room was a delight (Grand Deluxe) with a great walk-in shower. Having the Charlie Palmer restaurant attached to the hotel was a plus. 
The only negative (small) was that housekeeping did not replace the soaps, shampoos on a daily basis although when I asked for additional supplies, they were quickly delivered. The complimentary shoe shine was a nice touch.
I would definetly stay there again if returning to downtown Dallas.