If I could add one thing....
Put a price on it. If it's firm, say so, if it's negotiable, say so, but put a price on it.
Too many times, after three or four PMs, I get "What do you think it's worth?" "Waddya gimme fer it?"
I can't be the buyer and the seller at the same time, please put a price on it, then we haggle if you're willing.
Next, pics are always better than no pics.