The MORElab member Juan Sixto has assisted to the 18th International Conference on Application of Natural Language to Information Systems (NLDB2013) held in Salford, UK. He has presented the paper entitled "Analysing Customers Sentiments: An Approach to Opinion Mining and Classification of Online Hotel Reviews" where he presents a system designed to mine client opinions, classify them as positive or negative, and classify them according to the hotel features they belong to.