If the location you refer to is off Portland Place in London, then I have visited there (once) before, a few years ago. Not to see this girl, however. If the same buidling it is the one owned (allegedly) by the guy you refer to. It looked like a block of flats (with maybe some offices on lower floors). Anyway, rang the bell, it was opened, some kind of guy at the reception (but reading the paper and hardly looked up) and I went up to the top floor to a nice flat. The girl I was seeing says she always used it when she comes to London. Wierdly, there seemed to be some business people having a meeting in a room off the ground floor. I imagine it is just a building with various spaces and the owner rents it out, room by room, to whoever will pay. Anyway, felt pretty safe - albeit a bit wierd. I imagine, except for Air NnB, there are few places, centrally located, girls from out of town can just use with few questions asked. Hope this helps - if I have the right building