Same cleaner every time means the access details get to one person, not a rotating door. We treat this like you'd treat a friend's house key.
You let the cleaner in. Most common for first-time clients.
We use a code or lockbox on the door. You change the code any time.
Concierge holds the key and lets the cleaner in. Common for downtown condos.
Tell us where it is. We use a coded lockbox that only the cleaner has the code to.