If you spent time cleaning the place up with another student to make it habitable then I would argue that both of you should have a say in how rooms are allocated. Did you have a discussion beforehand as to how rooms were allocated prior to everyone taking up residence? It would seem not. How is your rent payment agreed? Are you each individually paying the landlord or is one of you having the responsibility to pay them and everyone pays that person? It sounds more like a free for all greedy grab which is not a good sign for the group of you sharing together going forward? Your only comeback is to ask for a rent reduction (unless it is there already) for the smaller room. My advice would be minimalistic living. The less you bring into the room the bigger it will seem.