Glad you had a good experience overall. PBL is definitely VERY time consuming and can be VERY frustrating when you constantly get your questions answered by more questions. Sometimes I definitely wish that someone would just tell me the darn answer, but I also enjoy being an active learner, so I really like PBL. But, if you are questioning your learning style and how it matches with PBL then you definitely need to really think about if it would be a good match, because of the reasons I just gave.
As far as classmates getting along, I'm in the 2nd year class and we do all get along; there's only a couple of classmates that when I get put in a group with them I have to practice some serious patience, but for the most part when in contact with anyone I enjoy talking to them. That being said, I don't actively seek to be best friends with everyone in my program because I am in school for me, not for the social aspect. So, there are sub groups within our class (as all groups of people I'm sure!) that I am much more social with than the entire class as a whole.
Also, Pittsburgh is a small city; it's not like DC or New York where everything is so concentrated, but the city really has a lot to offer. Maybe I'm biased because I grew up in western PA and always wanted to live in this city and now I am, so I'm loving life, but I love Pittsburgh. It is not your typical city and sometimes that sucks, but sometimes I really like it too.
Good luck in your quest for finding the best school for YOU!