Many issues with parlours. Most you pay a "door fee" on entry and the balance of your 30 min or 60 min booking fee to the lady in the room. Choice is easy - if they operate an up to date website then check it for the ladies on the day you intend to visit. Most don't operate up to date websites so I would ring on the day for a list of who's working that day and have their website open in front of you so you can cross reference. Any ladies not on it I would ask the person on the phone for a description. You can book in advance or just turn up and risk a "pot luck", which I've done many times and rarely been disappointed. Of course, you can always leave and go to another parlour if no one takes your fancy. The ladies answering the phone are well used to punters ringing and asking stuff so in my experience they're usually very good.
The downside I find is they operate a production line and there are questions over the girls hygiene between punters. I always tried to be the first one of the day. Also, only one pop in 30 min bookings (usually) so these can feel very mechanical, like they're trying to get you to pop asap, then the bookings effectively over and I was never very keen on being in a room with other punters so if you're waiting for your girl to become available you have no choice!
The upside - good selection of girls, set pricing so you know where you stand. I've had many many excellent experiences in parlours but haven't been for years (with the exception of Diplomat in 2020).
Give it a go - it's all part of life's rich tapestry - and please report back!