Which floor is affected?
Explain whether there is an upstairs room, attic or another unit above the leak. Do not assume the stain is directly below the failed pipe.
Is the water isolated?
Say whether the property shutoff has been closed and whether the visible leak changed. Never enter a dangerous area just to confirm a valve position.
Is the ceiling changing?
Report sagging, cracking or a growing wet area. Keep people away rather than attempting to puncture or remove overhead material.
What access is available?
Tell the provider about locked rooms, shared units or an attic hatch. The person authorizing work should be available to agree on necessary access.
Which repairs are included?
Ask separately about the supply pipe, opening the ceiling, water removal, drying and reinstatement. Those tasks may require different people and different estimates.