Yes, I think Adam is correct.
Multiple fake ads with different descriptions, pics, and phone numbers will steer you to the the same girl at one of a number of addresses.
A different girl at each address.
While exceedingly rare, one of the multiple ads may sometimes show the actual girl and room, but you never know until you arrive. Thus not every ad nor girl is "fake", but you won't knw until you show up.
The multitude of "fake" ads is probably a marketing strategy to maximize exposure and uptake. Horny guys rarely turn around and walk away.
A Clayton park residence, a Fairview apartment, a South end apartment are some popular locations, each with a specific girl who stays there for a period of time, before being replaced by another, and I think these locations are all related. You'll catch a hint of this when the ad says..."new girl, same place", etc.
A Dartmouth motel seems to the base for a separate "agency" with girls like popular Asian Anna, and the pics are more reliably accurate.