Rosemont is good.  Close to the airport.  Also Schaumburg which is just a bit further west is also a popular area to host.  I hope to visit with you when you are in Chicago.

Schaumburg and the surrounding communities are very popular because of their proximity to O'Hare and their accessibility from a N/S and E/W highway. It's the area I prefer, but I can't promise I can make an appointment to see you when you visit.  If you want to stay closer to O'Hare I would suggest suburbs north and west of there and staying away from the suburbs south  of the airport. I rarely travel into downtown Chicago, but many clients and local and visiting providers would recommend that that area as well or the north side of the city.  You would have to ask someone more knowledgeable than me about preferred hotels in those areas.

Close to the airport.  Resulting in nearby major highways, making it accessible to a broader region.  Hotel rates are much more reasonable than downtown.

 
But, if you're looking for the whales, you'll find a large population of them downtown or nearer Schaumburg.

Rosemont is great!