I couldn’t agree more with the enjoyable/frustrating question. I ALWAYS ask that of EVERYONE I talk to. It tends to really shine a light on how things run.
I word it a little differently (same questions though)
What do you enjoy the most about working here/What is the 1 thing you would change if you could (alternately, what is the thing that most often frustrates you)
Build a rapport with the person you are talking to and it is amazing what comes out :-)