Very Friendly, Easy and Comfortable
I stayed at the Omni at South Park three nights for a convention. They are located close (but not too near) the airport and offered a free shuttle, which was VERY welcome. The driver was very friendly--saying he loved the convention, and answered our questions about Austin and was just very welcoming and informative.
The staff throughout the hotel were fantastic--the Reception Desk (never a wait, always quick to serve and to ask if we needed anything), Room Service was great, Bell Desk kept our bags after we checked out and had some time before our flight and helped load cars. We had several banquet events and the food was good (not amazing and gourmet, but tasty and filling). I ate at the restaurant, and that was very tasty, too, with friendly waitstaff and quick service. 
... there was also a lovely indoor/outdoor pool, but I never had a chance to use it!
My room was nice and quiet. The a/c cool in the summer heat (it was August). The bed was very comfortable and I slept very well.
The convention is planning more events at this hotel and I'm looking forward to it. The whole experience was just very pleasant.