I don't know where you're located OP but for mine, the travelling, not only back and forth, but for her visiting friends at other universities (and taking city breaks overseas) has been incredibly easy, accessible and cost effective from both Dublin and Belfast - we have more experience of the former over 4 years as she is just finishing her UG studies there, but moving to start work in Belfast this Autumn. Like previous posters, both south and northern Ireland are full of students that remain after studies to take up their first posts.
Her own impression of Belfast, having stayed 8 weeks over 2 years' internship runs is that it has a great vibe, not so intense or touristy as Dublin (and definitely not like London), but encourages a good work/life balance. Lots of Queens/Ulster alumni, all lovely, hard working people. Like in Dublin, students do go 'home' over the weekends but this for her, hasn't been a bad thing, and there are plenty of different friendship groups to mix with if you are the sociable type. QUB is stunning, with good quality accommodation, though rentals are higher once in the professionals market.
As a Brummie myself having lived around much of the UK and London for the past 30 years, each time I visit Belfast, I cannot believe just how friendly and warm it is. Every time.
The bursary in Y1 at Queens is a nice touch to attract more non-NI students, with those achieving high A level results also benefiting from additional £ scholarships, subject permitting.
I would say it's not for everyone, is definitely not on the radar in the same way as other UK universities but from DD's cohort across STEM and humanities, those that are not going to PG studies, most seem to have gained solid placement/internship access at TCD and QUB (can't comment for other universities) and now gaining first rung opportunities in their respective sectors across the Island of Ireland, as well as roles on UK mainland.
Punches well above its weight (in my opinion) but this is purely from observing DD's year group.
Good luck to her on deciding!