(the following is a guide only which will really help to get the best results from the photos)

All rooms to be as clutter free and tidy as possible, this is more important than hoovering, mopping floors. Ideally please remove any personal photos (unless attached to the wall)
Bedrooms-beds all made up and curtains open, shoes and clothes tidied away
Bathrooms-remove shampoo bottles,shower gels and bathroom cleaning products. Often in bathrooms the camera angle of view is restricted so its also best to remove towels+bins too.
Kitchens-surfaces clear and clutter free, washing up liquids/cleaning products tidied away
Exteriors-please remove wheelie bins from the front of the house and ideally have the front driveway clear of vehicles