I personally live in London and have many friends that live in Roehampton, have been there lots.
I'll put it one way - its not a nice area.
Not that its dangerous, although rough and trampy, one of the worst in South West London.
The uni is next to an estate which is dodgy.
I can't say anything for the uni itself.
If you're from London then it's probably not something you've never seen before but if you're not you might not like it.
It's a small area but lots of estates and chavs and people like that, mostly blocks and in London they're not the best places. The areas surrounding are nice 25min bus to Wimbledon, 15 to Putney and Southfields, also quite near Kingston, but its just Roehampton.
Go on google maps and street view and take a look for yourself. I'm not even considering Roehampton because the area is awful.