I would hope the one who answered this question on July 24, 2012, isn't a licensed real estate professional. Your opinion is in violation of the code of ethics and could be looked upon as blockbusting. Be careful what you say about any particular area. It is not your job to pass out information or advise as to the appropriateness of any given area. What you should do is provide or advise where one might go to find the necessary information for them to make their own informed decision.
Pro's: Good restaurants and bars
Cons: Crime, crime, crime, and more crime. Your car will eventually get broken into. You will probably eventually be robbed if you live there long enough. You get what you pay for. The weird thing about St. Louis is that you get used to crime and you think its normal. When you live elsewhere you realize that it isn't.
I love Clinton's answer. DeBaliviere Place is a wonderful neighborhood with tree lined streets, Forest Park within walking distance, and some great restaurants and bars. You can choose between a short car ride to Hwy 40 or a short walk to the metro. One of our two offices in located at Belt & Pershing. Cons: well, you don't live there ;)
The best way to find out what the pro's and cons of a neighborhood is would be by visiting at various hours of the day, different days of the week. You may find it helpful to speak with any neighbors you see walking or working in their yard.
Wonderful answer Clinton. I tell my clients if you are interested in a neighborhood, drive through it early morning, mid-day, evening and night. Stop and meet your potential neighbors. Let them know you are interested and will they will be be glad to keep you informed.