My wife and I stayed at Farthing Corner on a trip we took throughout most of England and Wales. We stayed in the Cottage which is an outbuilding to the main B&B. I would underline that if it was simply cleaned more thoroughly it would have been a cute place to stay, provided you like being in the country and dont mind the rustic nature of this place.
The owner was somewhat friendly, but slightly condescending at times. Im sure it wasnt intentional, but is a matter of fact.
In the cottage we found the floors and bathroom very dirty, a shower head in need of repair and spiders in most corners. The bed was comfortable but the sheets musky.
We requested an early breakfast which was kindly accommodated, however my wife upon taking her first spoonful of cereal noticed that her spoon was dirty. Yuck!
My parents, who stayed in a room in the main building reported that their room was cleaner but could not stand the smell of the place. Again, it is very old, so not sure why this is, but again, it's hundreds of years old.
Generally speaking this place is not worth the price, nor is it a five star by any standards.