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R2RML is a W3C Recommendation that provides for the declaration of mappings to generate RDF datasets from relational databases. One issue that hampers its adoption is the manual effort needed in the creation and maintenance of such mappings. To tackle this problem, various initiatives have started to emerge. One of the directions is to investigate how different representations can facilitate the creation and maintenance of such mappings for a wider set of stakeholders. In prior work, we proposed a visual representation based on the block metaphor for R2RML mappings that is compliant with this specification. This representation has been integrated within a tool for creating and managing R2RML mappings. In this paper, we report on a user study to evaluate the proposed visual representation considering stakeholders with different background knowledge. Preliminary findings indicate that participants were able to create accurate mappings and that the visual representation achieves good results in standard usability evaluations.