I lived in Dublin about a year ago, and have just checked the sites and there's been an almost completely clean sweep of everyone in the past year!
There are only two that I have experience with:
https://rentmen.eu/Eduardo_Portugal - Sweet man, a little quiet / shy at first. Fibs a little on the age, but don't we all! Lovely massage, decent bottom.
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- Power bottom, exhibitionist! Very nice body. Perhaps a little pushy?
Re Boilerhouse, I've not been in a long, long time, but my friends say weekend (Friday and Saturday) evenings are best. If you like younger, then often the early hours of the morning after the nightclubs have closed have been the best! Midweek is very quiet.
Enjoy your trip - it's a great city!