5 stars all around! We were within walking distance to a subway, the aquarium and field museum, union station, and plenty of restaurants. The building needs a key code to get in the main door, each floor, as well as the Airbnb so my group felt very safe. Tony was quick to answer any questions and comments which was appreciated. Like others mentioned, it is close to a train that runs often. The people who slept in the living room didn’t mind the noise though. Overall it’s a great stay!