The easiest thing to do when trying to market your rental property is make it appealing. The question is, how do you make something appealing when the styles seem to change daily? This, unfortunately, often means you can't do much in the way of heavy decoration. Generally the best way to sell a rental is to make it a blank canvas. Unless you are going to supply the furniture, less is more. This means keeping mostly blank walls painted a slightly off white. It may seem boring, but at least people will be able to see what they may want to do with it.
If you have recently acquired a place to rent that hasn't been renovated in a while, this may be something you want to do quickly. Busy wallpaper in the kitchen and pink and blue tiles in the bathroom were popular once, but they certainly wouldn't have a picture in Better Homes and Gardens today. Keeping wooden cabinets up are normally a good idea, but if they've been painted white or yellow you may want to replace them. Again, styles change but simple and basic is normally a good way to go. Your residents can always make slight changes if they wish.
Keeping up with the changing times, especially in trends and fashions, can be exhausting. Use your best judgement when getting your rental property ready for the next tenant. If the place looks like somewhere you would feel someone's grandmother would have decorated, perhaps a change may be in order. Try keeping it simple and see what comes of it. It can only help you in the end.