My advise would be similar. Also check on the website for the lenght of time the rental owner is advertising, if the owners is advertising for a few years, then this is reassuring. I advertise my holiday home and am very aware of guests fears.Have you signed a contract, again this helps. Ask the owner to call you, often this is reassuring. Ask for references from past guests. Search for the property on Google earth if you wish, some guests can be fearful that the property doesnt exist!
I do know there has been incidents of people paying for rental properties that dont exist or are not owned by the advertisers. These are very rare and generally are advertised at unbelievable low prices, so if it seems too good to be true, it probably is!
Enjoy your hoilday.