I don't waste my virginity
If you build it up thinking it is going to be something special, then you are almost certainly setting yourself up for a fall. You will spend hours and hours doing research and could still be disappointed.
There is no guarantee of a decent sexual experience, whether that be with a civvy or an escort, even a proven one. Anyone can have a bad day.
My advice is don't build it up, just see it as a literal and proverbial notch on the bedpost, get it done - whether good or bad - forget about it and move on to the next.
However, going on the reviews here (not seen her myself) a few hours with Adele seems to be as close as you could get to an assured great experience.
I've seen Aleksandra and she is cute, a great girl and provides a good service.