I was recently here for a training. The Marriott Quorum had the best "seminar" food that I've ever had--breakfast and lunch were excellent. The hotel also has one of the best exercise facilities of any hotel I've been in thus far (I'm 45); it wasn't just an afterthought of a room with a treadmill thrown in for good measure.
As far as sleep, the first night was a bit loud--I stayed on the side facing the North Dallas Tollway. The location is otherwise very convenient--walking distance from Beltline and many restaurants in Addison.
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