And to answer to Anon as well.
It is a very difficult thing to know. A client, even a regular will visit an escort when she is aware he will be coming, so if she has something to hide, she certainly will take care of everything. Is not like you're going to see in her room the "pimping agreement contract"
or be introduced to the said pimp.
Girls sharing can be an indication. Still, not sufficient as many girls may work in pairs for their own safety. I think I would be safe in assuming that any more then 2 girls in one place is dodgy as hell though and goes beyond the safety issue.
The proverbial knock at the door when time is up is to me also an indication that someone else controls or is helping to control what the escort is doing. If I would share with someone and I will get a knock on my door I will be truly pissed as it is my business how long I am spending with someone or if I want to run a little behind time. Still, the modern times and the internet knowledge has caught up with a lot of pimps and the clever ones are probably encouraging girls to act as independent, for the fear of his business being known.
Level of english and knowledge about Ireland (how to rent, how to get a PPS etc) is a very strong indication. Someone who doesn't speak English at all has a nice cosy apartment, sometimes even by herself or sometimes shared with some other non English speaking girls ? That is DODGY. I know many apartments in Ireland are empty and the letting agents go very easy on tenants but still, they would not rent to someone who makes it very obvious they cannot get a job here due to the fact they don't speak the language. There are a few circumstances where maybe a friend has helped the non english speaking girl but those situation are extremelly rare as people in general are not that charitable.
Also very dodgy. You just paid an escort and she needs to make a phone call in other language, or send a text. Many times a client won't see this, as he may be showering or the girl may dissapear from the room with the money. But if you see it, do take it in consideration. If you repeat the visit and the same happens, it is almost a sure thing. Why the phone call / message? As some of them are controlled by phone, if they don't answer when the boss rings, it is deemed they have an appointment that they haven't declared (thus keeping the money for themselves) and this spells trouble.
What else? Phone calls handled by someone else? This is 50-50. Sometimes there is a genuine reason and the escort is not confident in English or doesn't like to be on the phone all day and she can get someone to handle her phone. But also girls who are working for someone else and don't know English can use this, only the calls will be directed by the "house".
In general, the best thing to do when booking an escort is to search her pics trough Google Pics, search her phone number in google too (if you get multiple different hits and pics, then of course it is an agency or a con artist /faker). Check also reviews that may speak about the way she handles business. If you book, see if she is answering her phone calls and if not if she has a reasonable explanation for this. In the apartment, check for noises and any calls she may make shortly after getting the cash. It is not foolproof unless you observe her profile for a long time (and very few can do so), but at least you eliminate the most obvious cases.
It used to be so easy to spot an agency before
Similar set of pictures of a very poor quality, showing the same furniture, girls always with 24 hr schedule and with everything in their favourites, always having a duo partner and lots of reviewers in common (!). Unfortunately, only the really silly pimps do this anymore, as most of them caught up with the modern times. They bring the girls to professional photograps, they change their schedule, they even encourage girls to register on EI and flirt with the boys for a better business outcome