Cafe Di Perugia
Via Giuseppe Mazzini, 10
Via mazzini, has very nice decor, and a smoking lounge upstairs for days when the weather isn't so great. they do a very good hot chocolate.
Merlin Pub
Via del Forno
Via del forno. good place to drink, good mix of locals and students alike. good offers on beers, remember if you get a leaflet, make sure the barman sees it, otherwise you will get charged full whack. look out for pisco, the owner, who will love to give you a free welcome shot.
Punta di Vista
Via Indipendenza
Just off the piazza italia, open air bar which is open in the summer. nice cocktails and like the name says a beautiful view.