Leeds is really friendly, and going by the experiences of others I'd say Leeds is one of the best student cities there is. The social life tends to be split into 2 halves, people who are into their dance music go to the clubs like Oceania, tiger tiger, halo, gatecrasher etc, and those of us into our rock music go to the dry dock, carpe diem, fab cafe, the cockpit etc. There are loads of inbetween bars as well, mostly reasonably cheap with loads of offers on.
Public transport in the city is mega, Leeds runs a free city bus to a lot of places. Leeds city council also puts on loads of free festivals and events throughout the year.
The uni itself is amazing, I believe it has the highest rated student union in the country, and that's a well deserved title. From my experience there are no cliques or unpleasantness among the students, everyone wants to get along.
The lecturers tend to be genuinely interested in the welfare of their students (not sure how true this is across the board, but it's certainly true for humanities)
I have had the time of my life since moving to Leeds from Nottingham, if there's anything specific you want to know just ask