Say that if the room is substantially smaller than the others that you think the rent should be lower ... either that or you all swap rooms round halfway through. I personally don't think it's fair that they decided this way when you all didn't have equal access to a computer, and didn't know that it was going to be decided this way - also, presumably the emails were going to someone who's also going to be in the house, surely that means that one person was 'first' anyway? Tbh, it seems a dodgy way of doing it all round, and to me it's a way that's definitely going to annoy someone. Far better, if you can't decide on the rooms, to do it face to face in some truly random way, like throwing a dice or drawing straws.