@Claudia3884. Hi Claudia, you need to do some local research. Go onto Airbnb in public browsing mode and click though Miami listings to see who is getting booked, based on posted reviews. Then look at their facilities, pricing, guest feedback and compare to yours.
Its very soft demand at moment, based I suspect on economic conditions worldwide (travel is a discretionary expense so one of the first to get cut back) as well as new listings from those trying to make extra money. Plenty of demand for medium- longer term rentals : though thats a different business model entirely.
Good luck.