Are you sure that PVA is waterproof? The usual material for damp or wet conditions, as an adhesive, is somewhat different. I think it might be UVA, but doubt that it will form a good vapour barrier, as it is basically just an adhesive. But either of these will act as a bonding agent between layers of concrete,
I would suggest Synthaprufe, 3 coats, over bare concrete. Sprinkle a little bit of sand on top to give some grip for an overcoat of concrete, screeded and trowelled to get a decent finish
But obviously there are many other ways of doing it. You really do need a vapour barrier, which ideally would have been incorporated within he concrete, between the base "blinding" and the main structural layer, although on top, below the finishing layer is ok too. I say this, having had a huge amount of trouble with some utterly dishonest cowboy builders who did nothing of the sort and caused severe damp in my house and next door too. Check-a-Trade is a front for criminals and idiots, as I now know. The whole lot had to be dug up, at vast expense, by another builder.