The whole 'self catered residence' thing is really confusing. I'm in one, and I'm a first year undergraduate, and I know others. hmm.
As said before, the set out is like Pollock (rooms along a corridor, shared bathrooms), except with a more functional kitchen (ovens, freezers!).
You also get bedding provided and kitcheny things like pots and pans, which you don't in flats.
And it's mixed sex along the corridor. Although more guys around me in practice.