Stayed at the Hampton Inn for 4 nights. The hotel is very centrally located in downtown Indy. You can easily walk to the football stadium, the Capitol, or the basketball arena. Also, there are numerous restaurants and bars within walking distance.
The place is not fancy, but the room was clean and well maintained. The staff was very friendly. One person even went out of their way to let our son shower when we arrived back past check out time.
Lastly, the price was very reasonable in relation to the other hotels downtown.