I woke up at 3 am to the sound of dripping, and I found water leaking through the bathroom ceiling. I didn’t want to wake the portero at that time, so I stuck a bucket under it and went back to bed.
I told him in the morning, and when he checked he found the people upstairs had gone away for the weekend and left a tap running! He stopped the problem upstairs, but it will take some time for all the built up water to come through, and the mark on the ceiling is still spreading!
I’ve told my landlady. Over the years I’ve learned that a perk of renting is you don’t have to bother about stuff like this — it’s up to the owner to deal with it. I hope it stops soon though as the sound is getting on my nerves!