I have a clothesline that stretches across my bathtub (the lines can be retracted and hidden when not in use). It’s not a terribly humid city (we’re landlocked) and clothes are dry within 24 hours. Clothes dry faster in winter because the central heat will be on. Our building’s outside walls are 2 feet thick so we’re well insulated.
The bathroom is the most convenient place for a clothesline as my washing machine is in there. While clothes dryers are not unheard of here in Budapest, the vast majority of people in Hungary do not have one and use lines or racks. Lots of flats have the retractable ceiling racks, but here ceilings will be 12 or 14 feet high.