"Hole-in-the-wall treasure!" is right on target. As before, Boustan struggles if you need attention to detail, but the food is honestly great. The Kafta Arayess has just about made me forget the Shawarma for good.
Only two things to keep an eye on: one, the overuse of garlic mayo - I'd argue to even just skip it given how good the hummus is - and two, that you'll need a very "Quebecer-like" voice to keep staff on-target if you need to custom order. You can request anything you like, but with orders coming fast and frequent don't expect yours to be anything more than cookie-cutter unless you keep an eye on it and speak up!
Boustan has a lot of history and the food is honestly worth going for, so don't let the new management get you down. It is, as it was, an oasis for the late night food traveller.