If your flatmate arrived first and took the better room would you be mad?

So I'm sharing a flat with my friend and I arrive first to the place. My friend arrived 3 weeks after I arrive. I thought that whoever comes first get to pick the room.

If my friend came before me I would let her choose the room. But in this case she was angry that I took the bigger room. It doesn't look that much bigger since both rooms look similar.

So ladies if you were in this scenario would you be mad? What should I do?

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