I think a good listener is you can make talker feel comfortable when they talking to you. One of my best friends she is a good listener, when you talking to her, she can give you advice and listen to you, give you respond at a proper time. However, my another friend is opposite to her, I don’t like talking with her, because when I tell she something she always interrupt me and talking her story, maybe she is a good speaker but not a good listener.