Very nice stay.
The Omni was a great place to stay in the south of Austin. We arrived very early in the morning, so checking in was not an option...yet! After sitting in the lobby for about 30 minutes, my mother asked me to see if they actually had rooms ready. As it turned out, there were, so we moved into the rooms. Good reception points for that.
The rooms are nice. This is an older hotel, but the bed was comfy, the shower was great, and the internet worked well. You have to pay for internet, but at least it's a daily rate of about $10. Your decision on whether or not that's worth it.
My mom and I did eat at the hotel restaurant, Onion Creek Grille, for lunch. It took a while for them to bring our food, but not bad on the wait. The brisket tacos I ordered were great! Very tangy, but not spicy, sauce, and the meat in the taco was tender. Well worth staying in for, I'd say.
Pool looks very nice. Did not swim in it because I forgot my trunks, but it's a good pool.
The one thing you will need is a car, because there is nothing in the immediate vicinity of the hotel.
The Omni is a very good hotel, and I do recommend it.