No, you don't need to know which room you're in. They're all exactly the same anyway and you'll be told when you collect your key on arrival.
Random point about tin-openers: buy an expensive one because it'll save you so much stress and cut fingers. I think that was one of my mum's words of wisdom to me and although everybody in my flat had a tin-opener, they all used mine by the end.
Also, washing-up liquid and cloths/sponges/scourers (whatever you like to use) aren't provided. You're going to have to wash up at some point!