JoPun

Went ahead and booked the 4* hotel in Millennium Park, it is the Hyatt on Wacker indeed. Thanks again for your assistance.

So I am considering booking a 4-Star Express Deal Hotel  in Downtown Chicago - Millennium Park Area from 5-6-2017 to 5-8-2017. Without taxes it's 148$ a night (with taxes 183).  Amenities listed are:  Business Center,  Free Internet, Fitness Center, No Smoking Rooms/Facilities

I think it's the Hyatt Regency Chicago, which seems like a good enough hotel for me, but also not necessarily my favourite. I'm wondering if I wait longer if better deals will pop up, or if this is the best I could get for a central located hotel in the weekend in May. 

Thank you for your help.