I don't know of a specific cottage but absolutey recommend looking on Alasdair Sawday's site
www.specialplacestostay.co.uk. You can easily search by area/map, price and type of accomodation (self-catering / hotel etc). I've booked a few breaks and their recommendations have been spot on and true to the name, they are really special, relaxing and unique places to stay! Their reviews give you a great feel for a place too.
I also find
www.tripadvisor.co.uk really handy as the customer reviews are normally pretty accurate.
Hope you find somewhere fab and have a lovely break!