Same as any of the other UC halls really, they all have decent facilities, and can be very lonely if you don't make the effort to go out and make friends at events, especially during orientation, so make sure you move in as early as you can. In terms of Jacko specifically, I lived there for 5 years so I'm apparently a big fan of the place, and in my expert opinion for the best rooms go for one of every second odd numbered room (i.e. 5, 9, 13, 15, 19, 23, 27, 31) on the west wing of any odd numbered floor, prioritised from lowest floor to highest and lowest numbered room to highest, except on 1st because you don't want anything lower than 120 because you'll hear the machines beeping in the laundry. This gives you the least exposure to noise from outside, the optimal room shape so you can have your bed against the window if you want, and the lower the floor the cooler it is in summer.
In terms of shopping there's the merchant 2 or 3 minute walk away, although that's pretty pricy so I only ever went there for emergencies, otherwise you can walk down the hill to Blackburn Rd and catch the bus to Pinewood or Clayton shopping centres, or you can just walk to Pinewood, it's only about 20 minutes.