I am a licensed Broker for 16 years and my advice to you is list your apt. ( i am guessing it's a co op) with a professional real estate broker of your choice. You don't know who will be coming through your door on appointment when you advertise yourself. I always have the buyers sit with me in my office and make sure of who i am dealing with,are they qualified to buy, before i bring a customer to any home i am involved with. If you would like, i can stop by and talk to you about your apt. for sale,just email me anytime.