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Sounds good advice.
I grew up in a house with pretty similar construction (solid stone walls, quarry tiles just laid on earth etc). Adding a (supposedly) 'breathable' limecrete floor with underfloor heating and proper ventilation has transformed it, it's now actually warm and the condensation is a lot better.
Vanneau
Pretty much exactly what our surveyor said to us. C18th stone terrace with partial flagstone floor laid directly on earth, inadequate underfloor ventilation and high ground levels outside = damp floor (and to a lesser extent, walls). He did say that lifting the flags and lining underneath was an option but would most likely drive the moisture into the walls. His recommendations were to sort the ventilation (currently has vents only at one side of the house), use the wood stove and keep the heating on.