Is this really a Marriott? Worst Courtyard I have ever stayed in.
I stay in Courtyards multiple times a year all over the USA (not to mention other Marriott brands). This property is akin to a Motel 6. Tiny rooms, paper thin towels, seedy maintenence staff, free coffee service that ends at 10 (thereafter they refer you to their Starbucks bar). 
When I checked in, the desk clerk told me rooms weren't ready on either the first or second floors, which I had requested, but would be "soon." 10 minutes later I decided I wanted first floor for sure and the staff member told me there were none available. She clearly appeared irritated that I vascillated in my choice. I seriously doubt that she was telling me the truth. Rest of staff over the remainder of my 3 day stay seemed poorly trianed and uninterested in any questions I asked them.
Find another Marriott next time you are in North Dallas.