I've never had a car that suffers so much from condensation inside and I've owned or had long term use of more than 20 cars in 37 years. There seems to be something wrong with modern Fiesta design as this is the 3rd one after having a mk4 and a mk 5 which didn't suffer like the Mk 7 does.
And I thought it was just mine! Never had a car like it for getting ice on the inside of the windscreen in the winter. I kept looking for leaks but everywhere was dry!