Was it just a feeling that the lady herself was watching you approach the place, or someone else? I know many ladies prefer locations where they can get a clear look at the punter as he makes his way up to her place, for the obvious reasons of safety and security.
I had one time where I thought there was someone a bit dodgy looking standing outside the side entrance of a hotel I was directed to, so I decided to go in through another set of doors. When I rang again and said I was already inside, I was asked to go back outside again! I reiterated that I was already inside, so she asked me to wait a minute, then she text me the room number. The punt was a good one, but I did think it was a bit too strange that I wad asked to walk back outside the hotel once I was already inside.
Fighting the Good Fight...