Leaks Reported by Tenants
A tenant can tell you where the water shows. They usually cannot tell you how long it has been happening, and in a terrace the honest answer can be months. Water from a slow leak soaks into joists and plaster well before it marks a ceiling.
We look past the stain: check the meter and the boiler pressure, test the obvious suspects in the room above, and narrow it to one source. You get the cause explained and a price for the repair before anything is done, which is what most landlords need to make a quick decision.