Which stone for garden/guest house?

We are planning to build a garden/guest house in our garden. We are already encountering problems during the planning of the masonry. The guest house is intended more for the summer and will not be heated. Which masonry is suitable so that the house does not become damp or is protected from moisture?

Holes! As long as it is well ventilated, everything is fine - if it is not properly ventilated, it condenses when the sun shines on it when it is cold.. also other materials that heat up excessively in the sun - such as aluminum roofs