I would recommend a guide book by Alistair Sawday's. They do a number of publications, Great B&B's, Great places to stay, Great Romantic breaks, great family places to stay, etc... each book is printed 2 yearly and a book is produced for each european country. Equally there is a website and it is very popular for the traveller who doesnt want any nasty surprises. All the advertisers have to have to be recommended and have a visit on a regular basis to prove they continue to meet the strick criteria set by Sawday's.
Also there is a walkers guide called Miam miam dodo (not sure of the spelling) that lists places to stay along the Saint Jaques de Compostelle.