Have you checked the availability calendar for the dates you are enquiring about? Don't waste time by enquiring about dates that may already be booked!
Ensure that you speak on the phone with the person renting the cottage.
NEVER pay directly into a bank account until you verify that the owner is legitimate.
Where possible, pay by credit card or a debit card
DO ask questions about the local area and the property - genuine owners will be happy to provide information.