No matter how appealing the photographs on a rental listing are, they cannot compensate for the opportunity to inspect the house for yourself. A reputable landlord or renting agent will always be delighted to show you around the property you want to rent.
Check the water pressure - there's nothing worse than moving in without a functioning shower.
Are there smoke detectors and do they work?
Are the room sizes as expected and advertised?
Do the electrics appear to be in good working order? Is there a certificate of safety?