The only thing that we thought some might find objectionable was that although there was no smoking allowed inside the buildings, it was not a completely non-smoking property. As it happens, the people in the room next to ours were smokers and it was impossible to be on the balcony and avoid the smoke when they were out there. This is just personal preference, but I think that it is something to make future guests aware of if it is a problem for them.
We very much enjoyed our stay at Weingut Cornelius. The house and grounds were very clean and nice, and the breakfast was wonderful. The room we had was simple, but very comfortable and definitely a good value. We would love to come back on another trip to the Mosel River Valley.