Which motor does your c6 have?
I thought the B6 S4 V8 was fairly easy to work on, although there wasn't much space for things on the side/front. Same for the 2.7T in the b5. That A-series chassis just didn't have a ton of room to cram those big engines into.
By contrast the A4 with the 1.8T was a dream to work on and I still maintain one of the best cars I ever owned. It ran me perfectly all the way up to 200k with minimal issues. We did the timing belt/wp service on it in a day or so, mostly drunk. It was a breeze and I wish I still had it. I sold it to pay the bills on that S4 that sucked shit.