OP, that sounds like a perfect solution. I was coming back to ask whether you had looked at private halls. DD is a second year student and I have just returned from moving her into a private flat and am a bit 
at how much costs mount up. (Wifi set up costs, cheap rug to cover beer infused carpet, cheap curtains that will actually block some light and retain some heat etc) Plus relieved that she is confident her flatmates will pay rent and contribute to bills, and not run out of money before the end of the year.
I would also not take rental figures you find on Rightmove as gospel. I rent out a rather scruffy house not a milliion miles away. Normally I rent to new graduates with (really) good incomes, but more recently the shortage of rental property means that families are interested. I do not rent to students, because I dont need to and because I would not want to risk upsetting the neighbours. If I did I would expect higher rents to account for the added risk and wear and tear. Plus new licensing requirements (small HMOs) are causing a lot of landlords to think twice about letting to sharers.
I would also question whether students really hang out in the bars and restaurants of Clapham North. I know there are plenty of middle aged mums having girls nights out 
, and plenty of well paid young professionals pretending to re-live student days, but I doubt there are many students. There will also have been teenage peers of DC whose parents are willing to fund them to hang out locally rather than venture somewhere edgier, but students dont have the budget. I took DD out to a well-reviewed restaurant near her flat. Cheap, large portions, and BYO. The formula that pleases students. The fact that the food was grim seemed not to matter.
She should live where other students live. Tooting is lovely. Green space, Lido, brilliant currys, a market, good shops (Primark), and presumably students from SGUL and elsewhere. Once she is settled she can look for somewhere more buzzy.