The castle is very nice, but on a sunday after 20:30h there is no one around. For a high quality castle or hotel (as the price is not cheap) it can do much better. Also everything is closed on a sunday in the neighbourhood, but Epernay is pretty close to get something to eat. There is not any possibility for that in the castle.
About the room, it is small (the standard room) en pretty regular. The bed is really hard. Not for us, maybe other people like it? It felt to us like we were laying on a trampoline, which was not fun for us.
Again the castle is very nice, but in the end you just want to have a nice sleep.