Yeah, I think they call those desk renting offices "coworking offices" in English. I work with a lot of random programmers and architects and such which is kinda interesting.
Well in my experience it depends a lot on the client and the project, but often there is a fair amount of freedom about the details drawing left to me. Usually we agree to something like the client can choose from the sketches i make and ask for changes if needed and this allows to keep the changes to the final illustration or what have you fairly minimal. It's usually understood that if the client requests a lot of redraws, especially something they didn't mention from the start than that requires extra payment. I even had some rare projects where I was given a hundred percent of freedom about what to draw because i simply needed to draw something cool looking to use as a victory screen in a game. Those were fun.
I mean, there is some boss feeling still, but much less than in a normal job. Also if I was trying to sell artwork or such and to survive of it then it's almost certain i would need to follow the trends, what sells and i don't like drawing fanart, for example. There's always something, basically. Think about it like this: Michelangelo did commissions, haha