This article aims to analyse the management of student housing allocation within a university. The research consists of allocating university rooms to students. As many requests for accommodation are received by the university accommodation officer each year, it will be impossible to satisfy all the requests by housing all the students in the university. Thus, a technique for ranking students is essential to select them. We propose a decision support system based on multi-criteria decision support methods. For this purpose, we apply the three methods AHP, WSM and PROMETHEE. First, AHP to rank the weights of the criteria, then AHP, WSM and PROMETHEE to rank the students. The objective is to find out how each method ranks the students. Then to compare the ranking results obtained by these three methods. Finally, we choose the most appropriate method for this case. As a result, we find that each method can rank the students. Subsequently, AHP compared to WSM gives a very different ranking result and AHP compared to PROMETHEE has an equal half ranking. However, WSM compared to PROMETHEE has only a slight equality in ranking. From an application point of view, we observe that AHP is not very practical for multiple alternatives.