they vary from accommodation to accommodation
you want to have separate fridge/freezers, if its one unit then space gets tight for 5
the fridge can get more congested than the freezer
it's important when you come to look for a 2nd year house, they vary even more and I made sure I got big freezer space for my house
Frozen food works out quite good value if you keep a supply of frozen veg/waffles and maybe fish/chicken fillets or some pizzas from the supermarket - when you are in a rush and want something quick you will appreciate that instead of spending loads on crap takeaways
I definitely think it's worth getting bags of frozen veg. Veg is what most students seem to lack in their diet but if you can just boil some in 10 min and throw it onto whatever other meal you're cooking, it helps you keep your veggie portions ticking over.
Students who live in Headingley, check out Jack Fulton's Frozen Foods in Headingley Arndale Centre for good cheap frozen food.