Fact- There are fantastic universities/colleges in and around london..u can do a quick search and see rankings.
Fact- US universities are not concrete jungles, even urban unis try and do a good job of bringing in nature, and in general urban US unis have better aesthetics to them than major urban british unis ( I have studied at both) . And there are major universities in US that have some amazing campuses, Duke, Berkeley, Colorado, Michigan, Princeton, UC santa cruz (go banana slugs, I am a summer term alumni :D), stanford, illinois, kansas, williams college, swarthmore, mt holyoke, brynmawr, just to name a few.
btw Northwestern’s campus is not exactly concrete jungle. here is an image of NW campus.http://www.enjoyillinois.com/illinoismediacenter/images/pics/HighRes/Chicagoland/northwestern_university.jpg
X2 Bhai in another thread I posted the same photograph. NWU campus actually looks better than Warwick’s campus in terms of being lush! It’s just that it is a hard decision for me!