I am the owner of a fully furnished studio condo in Destin that will be available for rent on September 12, 2013. It is directly across the street from the beach, a very short walk, and the Gulf can be seen from the front door of the condo. There is free access to 5 swimming pools, private beach, par-3 golf course, tennis courts. The condo complex has excellent 24-hour security. My condo is a non-smoking unit, and no pets of any kind are allowed. A minimum lease of 6 months is required. If you might be interested, please call Marianne at 850-269-2327 for more info.
I would recommend that if you want to deal with an owner, go to http://www.VRBO.com. Most of the property owners who rent out themselves do it on this site. You can look at their calendars and see what their availability is.