I'm looking for a long-term flat exchange between NYC (Manhattan especially lower Manhattan and Chelsea) and Paris in 2014. I'll be staying in NYC for a postodoctoral felloship at Columbia University between january-february 2014 and december 2014-January 2015. I live in a small (50 m²) one-bedroom brigth apartment in the center of Paris (district n°12) with 2 small balconies. It is on the 6th floor but no elevators like in many old parisian buildings. It is ideal for one single or one couple. It is located in a very quiet neighborhood with an easy access to the metro.