Well, the wage issue (provided it is implemented as discussed so far) is pretty clear. Household income max 75,000 EUR + 15,000 EUR allowance per child.
For me, the "first-time purchase" will rather be the problem... I already own a condominium. It's too small for us with two children, so we are going to build soon... I just fear that as a family we are not considered first-time buyers, even though I am the sole owner of the condominium. In that case, tough luck... I would have preferred not to have built up assets and instead thrown the money out as rent or saved it...