The room key was a big old-school metal thing with an owl keyring, which is cool but a lot more fiddly than a key card when you've got Hagrid hands (the more dextrous patron should have no problem). Also, it's not as fluffily cute as a real owl. The sharp metal edges of the owl will shred your pocket lining, trouser fans! It's best kept in a bag, or for the cosplay enthusiast, up your sleeve.
The big wooden door set the scene nicely, and creaked open to reveal a rather cosy room of about 10×12', all dark wood and grey stone with maroon and gold trim. It was hard not to grin. I was all but at Hogwarts!