Interesting - same thing happened to me about a month ago.
I was going to be around Maida Vale in the afternoon, and had a look on AW. There was an English MILF available that day, few AW FR's and nothing here. I decided to have a go anyway, and gave her a call - she sounded really nice on the phone, so booked for later. Arrived and found really attractive girl in her late 30's/early 40's, with a great figure and facially very cute.
Handed over the dosh and had a great hour.
A couple of weeks later, I thought I'd have a return visit and she's gone. I've checked several times, but no further trace of her.
My decision was not to review if she's disappeared, because there seemed to be no point.
The one that got away.......