Problems with Spanish property search

A few weeks ago, we mentioned the launch of Barcelona based Nuroa.com, the newest vertical search engine to enter the Spanish market. Other players in the Spanish property search game include Trovit, and Nestoria. One of the things we highlighted with Nuroa was the lack of a mapping system which has become standard on all vertical search engines that I know of in the UK, the US and elsewhere.
Victor Aloi, product manager at Nuroa, responded to our post via email, stating that the main problem in Spain is distrust among owners and agents:

80% of the agencies don't want to give exact addresses, because they usually don't have exclusives and don't want other agencies to get ring up the owners and try to get them to also list with their services. From the owner's perspective, the more, the better (within limits). She only has to pay the agency that brings a buyer. But from the agency's perspective, more competition is a bad thing. So they don't put addresses when they list with the portals or when they include properties on their own sites. That means that the mapping function becomes largely useless. We are speaking with agencies about ways to offer maps without losing their competitive advantage.

Victor highlighted that Nestoria also had a similar problem and suggested I read Nestoria's Spanish FAQ (English translation):

The Spanish market is peculiar in the sense that many owners who sell a property not sign exclusive contracts with a single agent. [The agents] in some cases prefer not [to] openly publish the exact location of the properties to minimize the risk that the buyer and seller close a contract between them without intervention by the real estate agent.

"Precise geolocation of the properties in Spain is a challenge," Nestoria's Ed Freyfogle told me via email, "agents don't provide accurate information. They instead say something like 'two bed flat in central Madrid'." Nestoria have come up what they think to be the best solution to the problem by providing maps on every search result page and by adding local information including train stations and local photos where possible. According to "J2" Nestoria's Spanish blog administrator:

... one of the strong points in mind when searching for a home proximity to a public transport station. While some Nestorians come from big cities, there are others to which the underground have not yet called to the front door, so we have to focus on our beloved renfe lines.
We have added a new list of train stations directly to the information related to each area. If you look for a home in Grenada and choose the option "Railway stations" below the map, you will see the mythical symbol of renfe at the point where the nearest station is located. [English translation]

So far Nestoria is approaching the problem from a technological standpoint focusing on pointing users towards the nearest train stations and other relevant information on their interface; Nuora appears to be taking a more diplomatic strategy by engaging agents to find a solution to the problem and Trovit appears to avoid the problem altogether by not even offering or suggesting any kind of mapping service whatsoever [see comments].
On a grander scale, it appears that the problems the Spanish vertical search engines are facing are probably part of a greater problem overall with the Spanish real estate industry. High profile political corruption and criminal activity is well documented . Urgent reforms and regulation is needed if the industry is to be taken seriously and expand on a global scale.