On our visit to Cognac we were convinced that Baron Otard's Chateau was right outside the city, on the wrong side for us. However I was pleasantly surprised to find it right in the middle of the old part of the town.
There are various tours during the day, in different languages. We had to wait an hour for the English tour, but it was well worth it. The cost was around 7 euros per adult and children under 12 free.
The guide was absolutley lovely, pleasant, knowledgable and very personable and polite. The tour gave a brief histroy of the chateau, followed by an overview of the cognac making progress ( I wont tell you anything more than that so it is not spoiled if you go!!)
Just to say if you are in the area DO visit. Excellent.