We understand that, as busy people, you may need to leave keys for someone else to access your apartment. You can leave keys at the estate office – just tell the staff who you are expecting and when, and they will deal with it for you.
Please don’t stick a note next to the entryphone – sticky tape and other adhesives damage the marble surrounds next to most of the entryphone systems. Repairing this involves a total resurface/shine of the marble which is very expensive.