If it's that one you might get some run down the hill I guess, but looks a little way above the river. A Boscastle/Lynmouth type event? Personally wouldn't be worried, but it's not my money. Really lovely place, though what's going on with that lounge behind the shop front. Rank carpet?
This is the place -
https://www.zoopla.co.uk/for-sale/details/59820261
The bottom of the garden runs alongside the river, but the house is higher (about 10 feet above at a guess).