My family has stayed at the Ambassador several times and have always come away with an exquistie feeling. Thanks, in part, to the excellent staff they have. Cudos!
It's an old art deco style hotel that has been updated to the 9's! Located in the heart of downtown everything is close by. They also offer a shuttle for several locations that aren't so close (i.e. Potawatomi casino).
And while your there, check out the Envoy restaurant. A very upscale restaurant with exceptional cuisine.