These are the places I have stayed in Illinois and can recommend.
Chicago accommodations
Old World-style hotel in a historic building with views of Oak Street Beach and Lake Michigan. Loved having a traditional afternoon tea at the hotel.
Hilton Magnificent Mile Suites
I had a very nice bedroom with a sitting area and a little bit of a lake view. The hotel is conveniently located near the lakeshore and the John Hancock building.
London House Chicago, Curio Collection by Hilton
Luxurious accommodations in a historic building, centrally located along the Chicago River. The rooftop has a bar with fantastic views.
Sonesta ES Suites Chicago Downtown Magnificent Mile – Medical
Newly renovated extended stay hotel close to the lake and Oak Street beach. I had a 1 bedrom suite which included a large living room and kitchen space.