The best accommodation choice near Coo is 4km north in the little ridgetop settlement of La Gleize. Here, a repurposed stable, once used by bored Belgian Queen Marie-Henriette, has seven small but characterful rooms with areas of exposed stone and beamwork. In the lovely sloping garden there's an outdoor swimming pool (open May to mid-September).
Breakfast is included in room rates, which fall by €10 per person in low season (see the website for date details). There's a two-night minimum stay most weekends. Reception also handles a series of apartments and villas in the same village. Across the road, the excellent co-owned cafe-restaurant Le Vert de Pommier serves jumbo mussels and salads along with a decent beer selection including locally brewed Gleiza, a 9% amber beer with slightly tropical tones.