Working with upper class students is always enjoyable as they ask challenging questions and are focused on learning topics taught than on grades. Working with lower class students is a bit challenging as they focus too much on the grades and miss information on the topics being taught. The impression given is that administration values the opinion of the student over that of faculty.
I worked as a language assistant at the Russian Department. Everyone starting from the faculty to the administration were really helpful. It was a great environment to be in, surrounded by inspired individuals, I felt everything was possible.