CitiSim´s project main goal is devoted to the design and implementation of a new generation e-infrastructure for the smart city ecosystem. CitiSim is an International R&D Project with the ITEA3 seal, involving industrial Partners and Universities from several European countries in the business of Smart Cities. As a result, it provides a Smart Services Platform that offers valuable information on multiple urban dimensions, and whose knowledge impacts directly on a large spectrum of users and domains with different interests