ok so the appartment is temporary, is it a money saving thing? I know it might make perfect sense but I can also understand that you dont want to. Also moving can be very stressful and now you are going to be moving twice. hmmmm But it is a good idea, maybe.
I dont know anything about the Cassander thing.
I keep on editing here, dont know why, yes I do its because I dont know about the situation. Do what you feel is best to be done Ne, I suppose it depends also on who could get upset, if its a vulnerable person, a newcomer or someone struggling for example then dont do it. Otherwise do so, I think you know what to do.
I tried to pm you but couldnt

Does your new apartment allow you the space to have him there? If not, maybe the powers that be already provided what you needed for your dilemma. 
Comment