I can't help about the college situation, are you an undergrad?
I do however know a reasonable amount about Margaret's. The are flats with 5 bedrooms, a kitchen/living room (pretty good size!), a bathroom and toilet. Every room has the usual university internet connection and normal college-type furniture. Access to each block of flats is by code and then the flat is unlocked by key (and you can lock your room too). It's located on crossgate, about 10 minutes walk (if not less) from Chad's and is very convenient for the centre of town.
I hope this helps a little, if you need any more info let me know!