Does anyone have any experience of what it is like living with older postgraduate students?

Haha you're a lot like me, thats exactly why i moved out of residences here in ireland this year! just could't stand living with such inconsiderate people. From the sounds of it you're making the right decision, and yes post grads take their work very seriously because the year is so intense and they have a lot riding on it, that said they are still students so i'm sure they'll chill out and have a laugh with every now and then but it definitely sounds like the right thing to do.good luck!