The place is exactly as advertised. I had access to the basement through a backdoor so I didn't have to bother the hosts at all. The only downside is the lower ceiling that cuts through the middle of the living space, but it is advertised as such. Just know that it's about 5'9" clearance so taller visitors may need to duck a bit.
The hosts were amazing and even took the time to chat with me about living in Chicago.
I highly recommend staying at Mary and Don's place.