Many sellers in Florida would give you a standing ovation for simply getting an offer! You neglected to tell us if you have a realtor. I am hoping that you do and that your realtor upon presenting this offer to you not only gave you a net sheet to see the actual difference in the offer compared to the list price when it comes to a net figure but that they also gave you a CURRENT CMA. I know in my area of Central Florida the CMA can change from month to month. What homes are priced for today may not reflect what has SOLD last week. You really need to look at the whole picture.
Hope this helps!