Hello Zeltdach,
your question is posed so generally that hopefully you are not expecting an individual elaboration now, right?
Basically, the subsidy becomes more lucrative the more children there are. In this respect, two children (depending on the year of construction, different subsidy amount) are already very advantageous.
Following from that, I do not necessarily consider Riester perfect for a childless couple without the desire to have children and a good income, but the other way around it makes sense... A good income, one or more children, only a part-time job is already very interesting.
Whether you want (and/or have to) incorporate Riester into a construction financing is clearly a case-by-case decision. Although the latter applies to us, we have completely left Riester out and actually use it as an additional retirement provision alongside the statutory and occupational pension and the property, and draw the full subsidy with the lowest possible effort.
It always depends on the complete composition of the construction financing in context.