The location, duh
Facilities (laundrette/ common room)
Lot of parties
Pain in the ass to move in/out (nowhere to park/stairs)
Stairs if you're high up
The atmosphere depends where you are, I'm in block F and it's pretty quiete.
Unite accomadation isn't that good in general compared to the others, opal, liberty living etc. My brother lives at prospect point, which is part of liberty, is waaaay nicer than grand central and cheaper.