It's a university campus with more or less 20k students. So, how can that be a "middle of nowhere"? Besides, Coventry is just 10minutes away.
My point is this: if you know how to spend your spare time and you spend it with someone you truly enjoys (girlfriend, best friend or someone you fancy), then location does not matter that much anymore. What really matters to people's quality time and attention is how it is spent and whom it is spent with. So, even if you are in the middle of London and you are with a bunch of people you don't like and don't feel to hang out with, believe me, you'd still feel alone and lonely.
Another point I'd like to raise is, when you look for a university to go to, it is important that you consider the prestige of the school because that would really count in the long run. Unless the universities you are trying to compare with do have equal reputation, then deciding where to go based on "fit" is the way to go. But in this case, Warwick vs Cass, I think there are really more valid points to throw Warwick away in favour of Cass that you should be ready to accept the consequences in the long run. Again, in terms of branding alone, Warwick is so much ahead of Cass and the gap does not get closer because Warwick is really doing leap and bound successes. The decision would be harder if the options were Warwick and LSE or UCL. But Cass? That's a joke.
Let me tell you something. In the US, students often follow the prestige of the school. Duke, for example, is in the "middle of nowhere" but it is one of the top schools in the US and students go there over NYU, Columbia, Fordham (all in NYC) or UCLA and USC (both in LA) because it is a very prominent school. And it feels like, someone is telling me to go to NYU instead of Duke because NYU is in New York City. That's total crap. That's what I feel for this particular case.