Birmingham is located in the centre of the UK. So you can go anywhere relatively lower prices
compared to other places! Furthermore, Aston university is not only very close to Train station(Birmingham moor Street is just 6mins walking distance) but Coach station is not far from the campus as well(10 mins from the campus). Personally i strongly recommend you to reserve ticket in advance(it is much cheaper than purchasing on site). Anyway, i did go Oxford and Cambridge and London this time.
London just takes one and half a hour if you takes Train. Personally, i go London quite often because there are many attractions such as Madame Tussauds British museum etc.. It's hard to narrow it down to explain why i go london that often haha. Anyway, i am quite satisfied the location of the campus due to quite low trip costs.