In my limited knowledge of Bristol uni (I live in the city but don't go to uni) I can tell you that anything in Clifton is probably a good idea because it's near to the uni, to the centre, and is one of the fanciest bits there is. Houses in Clifton are notoriously expensive, but I don't know about the uni accomodation rates. I would go there. I had a friend living in Northwell House (think that's what it's called) last year and that seemed nice enough, nothing fancy but certainly adequate - self catered flats, sharing a kitchen and bathroom with not-too-many others.