I got the same email about the bunk-bedded rooms. Edinburgh is my insurance and obviously I can't be 100% sure about getting my firm offer's grades, so this is very worrying. I sent a rather angry email in response, basically telling them that it wasn't acceptable. Worst of all was the line, "We understand that this might influence any decision you make in respect of Edinburgh and so felt you would appreciate early notice of this inevitable situation."
Two things there: firstly, if it were inevitable, they would have seen it coming and warned us before now. Secondly, "early notice"? Seriously? You've only got a week to respond to the email and, weirdly enough, some people have the crazy notion of going on holiday over the summer and can't check their emails regularly. And "It is of course very possible that the decision required above may impact upon your decision to come to the University of Edinburgh this year". Well it's too late now! Don't they understand that the decision has been made? Not amused at all by this.