Matthew
Never stayed at Le Plage but have beeen to its sister site a couple of times Le Manoir De Kerlut. Its about 70 miles from Roscoff (couple of hours drive). The area is nice and there are lots of places to visit. The island trips in particular are good, although quite expensive. Quimper is nice as is Benodet and Concarneau. Its definatly a good place if you like your seafood.