Should I buy a cash flowing duplex in St. Louis???

[Carl Brown]

Hi, I was contacted by a seller in St. Louis, MO that wants to sell me a brick duplex that is cash flowing $1,250/m. I've never been to MO and have very little knowledge of the market. I have only done deals in Atlanta and Florida. The price is low enough for me to take it down however, I'm uncertain and don't want to end up with a lemon. Anyone buying rentals in St. Louis zip code 63112 please share with me some market knowledge, it would be greatly appreciated. 

Thanks in advance,

Carl