I've stayed at the Ren ORD Suites a number of times, primarily on weekends. It's usually less expensive than some of the other ORD options & very easy access to the Blue Line. The exec lounge is closed on the weekends, but a full breakfast is offered in the restaurant w/ made-to-order omelettes. It's an all-suite hotel so there's really only one larger suite they can upgrade you to (which I think is termed larger suite on the website ). I got push back when I requested it on my last stay as an upgrade (they were willing to sell it to me). Since it was 1-night stay & my room was already a suite I didn't push the issue. Got a bit of push back on late check-out & that I did hold firm on, as my train wasn't until 6:30pm out of Union Station so I requested 4pm c/o. I found both the breakfast and the bartenders (obviously encountered at different times!) to be quite friendly/helpful.

Cheers.