They don't allow us to work in specialty areas ... we pretty much have to stick with med surg. But we do have a choice of nurses and facilities when available.
For me personally ... I wanted a veteran, experienced nurse. In my experience new grads tend to be too twitchy when it comes to taking students. Veteran nurses are much more relaxed with students.
And I wanted a nurse I had already worked with and was comfortable with. I also chose the last hospital I did clinicals in ... just because I know where everything is, how their charting and the equipment works, etc.
It's just easier all the way around instead of trying to learn a new facility all over again. So ... I can just focus on doing a good job instead of worrying about the small stuff.