More often than not, severe condensation is caused by the occupiers draping wet washing about the house, or failing to ventilate the bathroom during or after a shower. If the occupier does either of these, there is no way anyone else can make the house dry.
Have you any way of proving that you did not do these things?
//www.diynot.com/wiki/building:condensation_in_houses[/QUOTE]
Likewise the landlord needs to provide provision for drying clothes by providing a washing line or dryer. Its a two way thing, there are many irresponsible tenants out there and there are many irresponsible landlords. We have to take the OP at their word that they 'ventilated as much as possible', its a stupid landlord who is too cheap to install a fan when he knows there's an issue with condensation. Only then can the landlord start pointing the finger after he's done at least something to minimize the problem.