We liked the location of Jason's place. It was within walking distance of Wrigley Field (and many restaurants, etc.) and right by an L stop. We felt like Ravenswood residents for a few days. The place was clean and clearly had been refurbished recently.
As other reviewers have mentioned, it is indeed by the L tracks, and it is indeed a thing that you can hear very loudly. It's not a one-size-fits-all problem, as some people are going to have more of an issue with it than others. It's just something to be aware of -- for what it's worth, I'm from a rural area and prefer dead silence when I sleep, but it would not keep me from renting the place again.
One other note to those who are unfamiliar with Chicago laws: you need a specific permit to park on the street, but for our stay an on-premises spot was provided.