If the property is unoccupied
Make sure all windows and doors are locked and secure, if there are any cat/door flaps make sure they are secured. In winter leave some heating on, as this will prevent any pipes from freezing. Make sure that the fridge door is left ajar and that all perishable foods are disposed of. Household plants may need to be tended. It may be advisable to let a neighbour have a key to remove any free newspapers and post to stop them building up. Blinds or curtains may be adjusted every couple of days, hence giving an appearance of the house being occupied. Time clocks can be purchased from most hardware stores. These can time a lamp or light to turn on and turn off at pre-set times.