Wished we had stayed elsewhere.
We spent 4 days at the Hilton of the Americas. Within 30 minutes of our arrival we wished we had stayed elsewhere and it was downhill from there. 
On our arrival we were practically accosted by the valet folks demanding our keys and grabbing our luggage. Valet parking was $30.00 a night. Self parking at the attached garage was $15.00, with in and out privileges. 
The front desk did not have my reservation for an handicapped accessible room. The were able to assign us to and equipped room which looked out over the roof and the next building. I will say the bed was comfortable, but the room needed some repair - the right faucet on the sink was loose and moved around. The concierge person pointed us to only high end Restaurants - 3 blocks away from the hotel. We ate elsewhere as the prices for eating at the hotel were ghastly expensive: 1 pork chop was $61.
The Breakfast Buffet was ok and service was ok we ate there 2 mornings before the convention. 
After the second day, we tried to get a beer at the Café Bar in the Hotel. There was only one server. It took over 45 minutes to get a beer and longer to get food. We were told the kitchen was busy.
After the third day we decided to eat at the Café. Again there was a shortage of servers and a long wait for our food. We were told the kitchen was busy. More than half of the café was closed off. Our food was acceptable; my pasta dish was bland and tepid. The hotel was out of the local Houston beer, having only beer from "ALEC" member brewers. 
We were told we would not get a printed bill, but we did get one before we checked out. In the middle of the bill was a charge for Valet Parking: $30.00. This was corrected by the front desk, at our request.
My husband requested a bell person and a cart and was told, rather arrogantly it would be more than 30 minutes as they were busy. We carried our own luggage. While my husband was making the first trip to the car with our luggage, I got a call saying the porter was on his way up - I said no thanks and the a porter knocked on our door.
Wish we had stayed elsewhere.