For the money you can't go wrong. Springhill Suites is attached to the Couryard, Fairfield and JW Marriott and has a skywalk to the Convention Center. On the western edge of downtown Indy. Very clean, GREAT staff, nice free hot breakfast, free wifi, has a small 'pantry' for snacks, etc, etc.
We stayed two nights and will definitely consider the Springhill Suites for our next visit to Downtown Indy.