With any financial question, there's a HUGE variety, due to all the different financial circumstances of all the MNers who reply.
What we've found (I have a ds who has just completed his first year, and then many of my friends dcs are at various points in University) is that
a) cost vary, yes, from University to University, but also from one type of accomm. to another around the University
b) how easy / difficult it is to get a job varies University to University, but also course to course, as some subjects (tend to be the Sciences) have a lot more contact time, and some (vocational ones) tend to have placements, etc.,etc. - it's not so easy to say "they can get a job". ds worked throughout Yrs 11, 12, and 13 so isn't workshy, but he's not been able to get anything in his University town.
c) I have been surprised how much I've had to pay out at short notice. We worked out that his student loan just covered his rent, so said he could use that to pay his rent and we'd send him 'living' money each week or month. What we didn't realise is that, once you get your grades in August and confirm your place, you then have to stump up some hundreds of ££ for 'deposit' - yes, you get it back in the Summer Term, but it's a lot of money to have lying about 'spare' if you aren't expecting it. They are then expected to put down deposits for their 2nd yr accomm. by about Christmas in the first year - obv. before you get back your deposit for the first room.
d) Finding work in the holidays has been easier.
e) My ds has managed well on the budget he's had - getting really good at shopping and learning that vegetarian recipes are cheaper than meat ones, etc.
f) It's good to think of it as a 'graduate tax' rather than a loan though, as they only make payments as and when their income is above £21K.