velorinka,
Deferring to PB and Thrifty Bill, because decades of experience on all things bicycle, I find to be a wise choice. If South BK, stands for South Brooklyn here are a couple of recent offerings on CL:
Motobecane Road Bike - $200 (myrtle broadway)
19" VINTAGE NISHIKI MIXTE 1983 Custom Sport CROMOLY Like New BLACK - $360(Greenwich Village)The Motobecane may be a little large, and the Nishiki may be a little spendy. My intent is purely to get you back in the saddle, happy hunting!