Mary was very kind in letting me check in late. My flight arrived at 2 am, and was delayed beyond that. The check-in was pretty easy: punch the numbers into the keypad. It is a little dark, so I sort of had to count the keys to make sure I punched in the numbers.
The bed was extremely comfortable, and Mary has nice 100% cotton sheets on them. She does ask you to pull of the sheets and put them into the laundry basket before you leave.
For those sensitive to odors, the house has an odor which I associate with old people. It is also two houses away from the freeway, so traffic noise is audible throughout the night with the window closed. It may not be the best location for people who are sensitive to odors or noise. Otherwise, it suited me well for my late flight into O'Hare!