I have browsing been Cuenca property listings for a few weeks now and have noticed that the same apartment(judging by the photos) will be often be listed at higher price on certain websites. Also, I have noticed that certain websites will provide additional information, such as more specific information about the property's location, which is useful in judging where it is.
Here is an example:
CuencaRealEstate.com $89,000
ecuadorablehomes.com $84,900
hatibarenecuador.com $85,000
Here is another example
Habitarenecuador.com 125,000
CuencaRealEstate.com 129,000
bienesraicesorellana.com 120,000
Draw your own conclusions from this, but I would start your negotiations at the lowest price published, and go from there.