Hello all, am new here

My Nan is looking to move back to the UK as she is missing all of us lovely grandchildren (yes we do visit her regularly). She wants to sell her property in Torrevieja but isn't sure how to go about it, she would rather advertise privately than pay the expensive agent fees (she is on a pension). my question to all you most friendly people is:
Does anybody here know of websites/forums where she (I on her behalf) can advertise her property.

Any help would be most appreciated.

Kind regards

Kay xx