Possible rising damp?

We've just recently moved into a 1930s~ property whereby the bathroom toilet is situated downstairs as part of an extension. What would be the best way of approaching this? Mindful that there is rising damp even if we were to make this seem more presentable in the short term

We've just recently moved into a 1930s~ property whereby the bathroom toilet is situated downstairs as part of an extension. What would be the best way of approaching this? Mindful that there is rising damp even if we were to make this seem more presentable in the short term