Not a B&B, but right outside the gate to Rondeau on the east side of the road is a place that has some small apts. Cannot remember the name, but is was clean and had a kitchen for cooking etc They had bikes to ride into Rondeau. Sorry, cannot remember the price, but we showed up and stayed for 2 nites in Mid May, had not booked. We were keeping our eyes open for a B&B and did not see one, but then again we could have missed it, but this place was Ok and very convenient outside the gate. There is a good restaurant at Erieau, maybe 20 min drive? that serves good fish and chips. It is on the right side as you come in, white building, darkish inside, but good food.
Enjoy your trip to Rondeau.
Cynthia