terraplane8bob,
See if you can find the Absolute Sound article on top 10 concert halls, about 1985. Earlier I wrote about how the 25th row of the Musikverein (#1) was pure reverberant muddy garbage, but the 5th row was quite good. I never got the opportunity to sit front row center. I envy your pro experience of having played on that stage. For listening, I would choose a close seat in any high school lecture hall over the 25th row in the Musikverein or any other esteemed hall. There is a lot of ignorant hype from audio writers with limited musical experience.
While in Vienna, the host of my group let us organize several string quartets. We each played for 5 min in an Esterhazy palace. I have no idea of how much furniture was in the palace 300 years before I played there. Listening fairly close to other groups, the sound was reverberant garbage. The high society people 300 years ago were not sound critics, but were there to hobnob with each other and chatter without paying much attention to the music, just like today.