I stayed for 33 nights, and I can say this is a great choice for an extended stay. The building was amazing, unfortunately the pool wasn’t open yet, but the other common areas were nice. You aren’t allowed to use the dog park on floor 2, or the private offices for rent hourly on floor 18. The location is perfect for an inner city visit. The unit had enough space, the bed was slightly uncomfortable and the cooking equipment was very cheap, but the closet is huge and the bathroom was very nice. The internet had reliability issues but you can call the IT support directly to reset your device.
Overall I would recommend this for a month in Chicago. You would be hard pressed to find a more complete packages than this.