Whoever did work in our place levelled the wall with cement, then skimmed with gypsum.
It was amazingly efficient at wicking water up from below the DPC that they also cemented across.
Also as an option 4. lime plaster (with horsehair, pozzolan and all of hat old-fashioned gubbins) then skim.
Same in my house all the internal walls are rendered. Make hanging pictures interesting.
On the plus side, the cement mix they used was so badly mixed, there were softer patches...
@Bobbo started
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Whoever did work in our place levelled the wall with cement, then skimmed with gypsum.
It was amazingly efficient at wicking water up from below the DPC that they also cemented across.
Also as an option 4. lime plaster (with horsehair, pozzolan and all of hat old-fashioned gubbins) then skim.