As Andrew knows from PM's I am considering renting an additional cottage/house nearby anyway. I have an ongoing project I've been shooting in Cornwall and rented a cottage not that far (less than 15 mins) from the one Andrew's suggesting, last year. I'll be there gain at the end of next month so can see what else is available closer to Marazion.
There won't be a problem getting additional accommodation if it's needed. There are thousands of cottages/houses in Cornwall let on a weekly basis to holiday makers