As you are coming in September/October, after the season, you will be able to find a "holiday winter let" very easily.

These are properties that are let out on a weekly basis, on commercial rents for the holiday season.

A large number of owners will then let the property from October for a 6/8 month period at a rental which is often less than a normal commercial rental.

This gives you a great chance to have a really good look at the area before making a formal long term committment.

The paperwork for these rentals is minimal.

I am not sure if I can name the sites on this forum, but if you google "long term rental" there are a number of sites that specialise in these rentals.
(PS I know that 6/8 mths is not really long term, but that is how these rentals are styled)

Good Luck.
Hope you find something suitable.