Tuesday to Thursday, not open Christmas Day or 26th December.

While there at this free institution, take time to stop at the coffee shop for some make-it-yourself crumpet dessert with strawberries and cream then add a spot of tea!

There are genealogists on duty some days during the week and you can probably e-mail to check which day. Re accommodation you can check airbnb where people advertise accommodation in their own homes at a reasonable price. There is a map on site where you can see how close it is to the library. Do check if there are buses or the Dart (light rail) close by. Have the location of you ancestors before you visit e.g. their address or if from rural Ireland the townland and barony from where they came. Check out Census Ireland also as the more effort you have put in to doing the research the more benefit a visit will be.

have you logged on to ancestry info on your computer and got information from births and deaths in ireland? ring the irish embassy and you will find someone there will direct you in the right way. you seem to have the names already so you might even try immigration in case they lived elsewhere.