Great staff...not such a nice hotel
Stayed here at a congress a few weeks ago. On the positive side the hotel is very close to the Dallas convention centre and the staff should to be complemented for their friendliness. 
HOWEVER, this is not a particularly nice building. Not sure when the hotel was built but not sure it's had a refit since President Kennedy met his end (the exact spot where he was shot is 2min walk from the hotel). 
The hotel is falling to bits, carpets stained, room and bathroom fittings rusting and cracked, aircon looks like reclaimed machine (and very very noisy!), basically it's not a very pleasant place. I would have moved hotel was it not for the fast I was too jet-lagged and other hotel options too expensive.
My advice would be to book a different hotel earlier.