Do they provide sheets? They usually do, but not towels. You'll need a couple of loo rolls, tea towels, dishwasher tablets (if there is one), washing up liquid. I always take a box with things like ketchup, cooking oil, garlic, coffee, sugar, tea bags, sanwich bags/cling film/foil, matches etc. I don't load up the car with food though - they do have shops in Cornwall!