Menthol, is there a reason you decided not rent first to be sure? That is often suggested on here and I think it makes a lot of sense. To experience the whole package for 6 months would give you an even better insight into what's in store. I say 'even better insight' because clearly you have already thought this through and done a lot of research but if there is even the slightest doubt, what have you got to lose - unless you are sure you have found the perfect villa/spot and don't want to miss out?
A long term rental gives you the opportunity to experience the frustrations as well as 'living the dream' without committing to a property you possibly may not use as much as you planned.
As Anne said, more food for thought -