As a rule of thumb: if you wonder if it's fake or real, it's most likely fake... Doesn't mean there's not someone behind the door... Text and see. If they don't ask a deposit, you might meet a girl and have service, just not the girl in the picture.
Personally I wouldn't contact that kind of ad, but some like the thrill of discovering the girl behind the door... Fells like a lottery...
Hope that helps, cheers