I did a quick search and there are 187 total rental listings in Marion Oaks in the last 90 days. 90 are vacant listings, 18 canceled, 70 that have leased, and 4 pending. 

However it is not listed in the top 10 of highest demand cities (most bookings) or most listings.

I call it being a concierge Realtor,  I have done it before for investors when they just need doors opened or comps but don't buy listed/on market properties.

I provide short term rental furnishing and renovation finish list that includes paint colors, light fixtures, cabinets etc.

If so, are you concerned about Spain's tax system on worldwide items?

Currently operating and cashflowing, listed for sale What made you interested in investing in this type of deal?

Amazon never sold all those items at first.

Should I just add them to my 'Cash Buyer List' and move on?

I can pay utilities, insurance, and other holding fees but I won't have enough to pay other cost like listed above.

You could tell them to cancel the listing and you will find someone else to list it after a month not 4 months (the market take is subjective too, all dependent on what your house has compared to others, where it is located, the size of it, and so many other factors).