Hi Sean,
You are possibly setting yourself a tough task if you book a place unseen over the internet, unless of course it is through a reputable site such as ownersdirect etc.. (where there are protection clauses in place - although nothing in life is guaranteed 100% proof!)
I would suggest a) pick an area you want to try living in
b) book a B&B for a week or so
c) do all your research once there - i.e local press, agents etc.
My own experience of renting in Spain is varied. I have had wonderful landladies/lords - who treat you (and your deposit!) with respect.. Down to the unscrupulous.
Generally - unless is is a total straight ‘cash deal’ (which actually many Spanish are not keen to do as it gives them little/no protection if you decide to squat!)... You are best to sign a ‘Temporada’. This gives both you and the landlord protection - in that you are guaranteed a place to live (as long as you pay your rent!) for an 11 month period. (There may be a possibility to do a shorter one?) All legal, all above board.
WATCH OUT for money grabbing rental agents. I still am not 100% sure on the LAW… But I have had to pay 1 month as a ‘finders fee’ to the agent (go direct to owner via newspaper ad to avoid this?), 1 month deposit to landlord (which should be returned as long as you leave the property as it was found - NB You should do a ‘walk through’ with a detailed list of contents/condition of property at beginning and end of rental period!)... plus I had to pay 1 month rent in advance. All worked out quite a lump sum! But at least 4 years later we do our annual renewal with landlady and as far as we know she is 100% happy with us and we have no reason to move unless WE want to!
Good luck - and let us know where you end up!
😊
ps - Here on Costa del Sol/Malaga there are lots of winter rentals for 6 months as it is not the ‘high season’ and the owners are desperate to rent out. (With a bit of research/local knowledge you should be able to pick up a nice property at a nice price!) Equally as someone said there are lots of owner out there who cannot sell in this climate and will take what they an get in rental!