Sheffield is wonderful. Best SU in the country, (and that was with half of it closed for refurbishment), different themed night at foundry and fusion in the SU every night - pretty much.
Loads of bars down west st/ division street. We are spoilt in terms of buses, 80p for a student single. Just amke sure you get the right 120 back towards halls. Nothing worse than being in a rush and accidentally getting the 120 towards the Hallamshire hospital and not Fulwood!
Really close to the peak district if you like walking/ biking and things like that. Tonnes of societies, if you can't find one you like/ are interested in, you're really not trying hard enough.
Doesn't feel like you're in a bit of a bubble like York/ UEA can do - i'll admit I applied to both, and i would have learnt to love the bubble had I gone.