Bronte
I would google them...usually you will come up with forum hits, where people complain about them or praise them.
Alternatively you could post a query on and ask if anyone knows of them...that board is populated by british ex-pats, many of whom are gite-owners.
We've booked many chalets over the net...had a problem with vrbo (villa rent by owner) in that the place was a kip and another place where the pictures on the net were simply stunning...but the reality was entirely different...we moved both times.