This is not a B&B, but a hotel with nice, although somewhat basic rooms and baths. The rooms on the pool/garden side have either patios (ground floor), or balconies, with an unbroken view of Mount Canigou. The garden itself is beautiful.
The folks who run it are friendly and helpful, and the location is great. You are about a ten minute walk to the medieval center, and also only 10 minutes from the gare. It is right off a key road that passes the edge of the city (although quiet), and there is a major supermarket on the other side of the road. The hotel has a large parking lot.
There are some nice hikes out of Prades, and it's a good base to take the petite jaune. I spent three days here, and would definitely return.