I have been accepted to CSoPP as well and I am considering it as one of my top two choices (the other being Nova Southeastern). Also, I went to undergrad in Boston so I know the area reasonably well and can also comment on the campus.
I did not apply to MSPP mostly because I wanted to move away from Boston. It is a great city but personally I just wanted to move somewhere new. The campus, if you can call it that, is not impressive. I remember thinking it looked like the back entrance to a grocery store, though I did not go inside.
I recently read the book "Blink", and though I don't want to start quoting pop psychology books, I think the section on packaging of products might be relevant. That is, the "packaging" of MSPP might lead us to think less of it despite the content, and that effect is something you have to be aware of (as much as is possible, anyway). Because of that, your "gut reaction" might not be reliable, since it can be easily manipulated by aesthetics--which ultimately has very little to do with your life as a graduate student or psychologist. I don't know much about the program itself but I have not heard anything negative about it, for whatever that is worth. However, I definitely agree that a car seems to be the best way to get there despite its "Boston" location. A car in Boston can be a hassle (or at least expensive) if you plan on living downtown.
I found the CSoPP to be very well organized. I felt like they would "take care of" students and monitor their progress in a personal way whereas other programs might be less attentive to individual students. Also, there are multiple concentrations and tracks which I think is important, and Chicago seems like a great city for practicum, internship, and life itself.
That said, I am leaning towards Nova over the CSoPP at this point, but mostly for personal reasons. I feel that my quality of life might be a little better in southern Florida (weather, housing, beach, etc that will just make day to day life more enjoyable) and the little money I have might stretch a bit further. BUT I have not decided yet and the CSoPP is still a definite option, so I too would appreciate any more opinions.