**4. Discussion**

The emergence of new 2.0 net collaborative economies has brought along a change in paradigm in the tourist-accommodation sector in the major cities of the world due to the proliferation of tourist housing. According to surveys by Guillen and Iñiguez [74], there is certain opacity in the market besides

a phenomenon that is causing gentrification processes in the main cities of the world. It also has a strong impact on real-estate market prices, with subsequent implications on cities' territorial sustainability. Thus, tourist housing is a complex problem for administrations, since there are conflicting interests among the different economic and social agents in these cities. Multicriteria assessment techniques, applied with geographical information systems, are a good tool that helps in the decision-making process regarding problems where there are different agents and criteria to take into account intervening. Surveys, such as the one carried out by Dredge et al. [75], support this investigation.

The concept of "reception capacity", which theoretically refers to the optimal usage of territory for its sustainability, is adequate for evaluating the loading capacity that every territory has. This is done based on guidelines provided by the World Tourism Organization regarding issues to consider when planning a destination under sustainability objectives.

The city of Cordoba has an unequal tourist-housing occupation in each geographical area, similarly to the obtained results for Madrid [76]. The central district, having 5.85% tourist housing over the total of built houses, is the one with the highest percentage, and it is composed of neighborhoods with unequal data, ranging from 17.14% (La Catedral) to 0.11% (El Carmen). This is the reason why it is not possible to generalize when talking about positive or negative effects since analysis for every neighborhood is necessary.

The results of our model conclude that the alternative neighborhood of El Carmen was the one that had the highest score, mainly due to the greater relative weight that decision-makers gave to the social-dimension criterion over the two other main criteria, economic dimension and environmental dimension, respectively. There are up to a total of five neighborhoods (La Catedral, San Basilio, El Salvador and La Compañía, San Lorenzo, and Cerro de la Golondrina) that have a very low reception capacity caused by different reasons. The Barrio de la Catedral is greatly influenced by the very low score of the subcriteria that form the social dimension, mainly due to population loss. Instead, it has a very good valuation in the economic-dimension subcriteria since having a greater number of tourist homes increases the income of owners as well as that of adjoining businesses.

Sensitivity analysis (Figures 10–12) allowed the simulation of what the score of each neighborhood would be if the relative importance of the different criteria and subcriteria changes; it is a very valuable tool for political leaders when it comes to taking decisions since it allows the continuous monitoring of neighborhood classification according to their more or less relative importance to each criterion. An example is the case of the La Catedral neighborhood, whose valuation increased as the relative importance of the economic-dimension criterion with respect to the social-dimension criterion increased.

The results obtained about the variation of population indicate that there are neighborhoods where, even though there are high percentages of tourist housing, there is no population exodus, such as the San Pedro neighborhood (Table 2). Likewise, the neighborhoods with the greatest population decline, such as the Centro Comercial and Huerta del Rey Vallellano, do not have the highest percentages of tourist housing, but instead, they do have a higher percentage of the population over 65 years of age with 26.28% and 30%, respectively. Therefore, it can be concluded that the neighborhoods that tend to lose population are those with the highest percentages of population over 65 years. These results contradict the studies that state that tourist housing causes depopulation in a generalized manner, and, according to them, a diagnosis of the demographic situation of each territory under study should be established. These conclusions are very important for public administrations responsible for deciding on tourism management, due to the impact it can have on the territorial development of any city.

Tourist housing is a tourism modality in expansion that must be regulated and cohabit with traditional offers. To do so, specific legislation is necessary to analyze each district's burden capacity based on surveys, such as the one planned for the central district of Cordoba. Analyses such as these provide a better answer to tourist-accommodation offers and demand cohabitation, which would make tourist housing sustainable and integrate it into the local economy. Therefore, the present work provides a valuable tool to public councilors of different cities with a tourist tradition to help them make decisions regarding the regulation of tourist housing. It is very useful for the political leaders and social agents of Córdoba since it allows decisions about permissiveness in areas where tourist housing can be beneficial for society as a whole or nonpermissiveness in areas where saturation exists and causes negative effects.

The tool presents some weaknesses, such as the need for large up-to-date information flows of a large number of georeferenced qualitative and quantitative variables.

**Author Contributions:** The authors are contributed each part of a paper by conceptualization. J.A.F.G.: introduction, theoretical framework, methodology, results, discussion, writing original draft preparation, writing review and editing; J.M.C.y.O.: methodology and supervision; M.G.M.V.d.l.T.: methodology, results, discussion and supervision.

**Funding:** This research received no external funding.

**Conflicts of Interest:** The authors declare no conflict of interest.
