Because it's just a truck load of awesome! Like many decent cities, the central area (where the university is based) is divided into zones which are all within walking distance, with the 'extremes' being Clifton (a very 'poe-shhh' and lush area) and the grittier stoke's croft (home of many a Banksy piece and other urban art). Every area has its own persona and cool place to go.
The variety of night life (heavy metal, chart, crazy rave, you got it), recreational activities, shopping etc are all phenomenal. Last year in Clifton I was a 4 minute stroll from a student clubbing area (the triangle), a 20 minute walk from Cabot circus (an amazing shopping centre) and a 5 minute bike ride to Ashton Court for some off road biking (over the suspension bridge).
The thing that really makes it though are the people. The people in Bristol LOVE Bristol - I've never heard a bad word. All the cider / wildlife festivals are packed with enthusiastic students and locals, there really is a sense of pride. I was a student there for 6 years and didn't get bored and many of my friends who have left are trying to find ways to return. It's a very happening, enthusiastic and cultural city. It's just brilliant, I can't wait to go back in September
I bet my
soul that you will not regret going to Bristol. I am
that confident.