One main thing I find is making sure the paintwork inside is good and no scratches, this helps give the image of a newer property. Also its good to make sure the paint is a light colour preferably white as this helps to make the rooms look like they are larger, in general dark colours will make rooms look smaller. Along those lines it is also good to have mirrors around the property because this gives the illusion of more space.
Lighting is also important and it is important to make sure that when showing someone around a property to make use of all the available lighting so that they do not miss anything, this is most important with lights that are sunk into the ceiling as these are easy to miss but expensive for you to install- so show them off and use them as a selling point!
If I am furnishing the property I usually make sure that all the furniture is all pushed up against the wall to maximise the space in the room. I would advise people not to have a coffee table in the room as this takes up floor space and can make the room looks a bit smaller and every little helps.
In most rooms I usually go for blinds rather than curtains as they usually look smarter, they don't get stained or burnt, they are not a fire risk, they are usually cheaper, and they will last a lot longer in terms of style than curtains, as curtains will become out dated and old quickly whereas blinds are more universal in terms of trends.
Usually for furnishings in terms of colour I go for whites and wood finishes. With beds I go for metal rather than wood as the wooden beds seem to break more easily than metal beds, and the wood usually gets scratches in it which is the sort of tiny damage that you cannot charge your tenants for, whereas in my experience the metal beds don't take that kind of damage. With sofas and armchairs I find that in terms of colour its best to go for lighter colours as they are more neutral and you don't get less people saying they don't like them. For kitchen furniture like tables and chairs wood seems to be the best option as again it's pretty neutral and you probably won't find that you have to update it because it is outdated for a while, whereas more modern tables and chairs you can find that they start to look outdated quite quickly and this is expensive to get new ones.
Finally I think that it is also important to make the property look like it can be lived in, but isn't being lived in at the moment, this is essential so people can imagine themselves living in the property.
But all in all the most important thing is to be friendly and approachable.
