There are 3 basic principles in real estate : location, location and location. Location is the most important criterion. So if there is one important criterion to remember, it is the location of a property. When demand is more important than supply, then prices rise.
Getting the best location is not an easy task as most buyers want the same thing. If you are the proud owner of a property that is close to many local services, business parks are quickly accessible and well served by public transport. So you can expect to get a good estimate of your property. A perfect geographical orientation, a good brightness, a quiet area and a beautiful view, in this case you are in a strong position vis-à-vis buyers !