Cathy's place is a great location if you plan to catch a Cubs game and/or visit downtown. The el is only a few blocks away and it only took about 20 minutes to get downtown.
You definitely will hear the trains and they are frequent, but none of us found it to be an issue. The provided ear plugs and noise machines are thoughtful and would be helpful, if needed.
Cathy was very hospitable from the very beginning and I'll definitely keep mind of this place for future visits.