We had a pleasant stay at the apartment. Location very convenient close to McCormick Conference Centre (we were in Chicago for a conference). Very close to Chinese area, great for restaurants. Only downside was the location right next to the elevated railway. You could hear every train as it was passing through your room, especially at night. Didn't bother me as I am a deep sleeper, but my colleagues complained a bit. Also the heating system was a bit noisy, too.
The owner was excellent and communicative. We had an issue with the coffee maker and he brought a new one in less than an hour.