Many thanks for your question, I hope that everything with you is okay in these strange times for traveling!
There is as you mention the 14-day quarantine period for international travelers going to the Republic of Ireland where you are required to self-isolate and fill in a passenger locator form prior to arrival, please have a look at our traveler health
page for links to information we have on the official websites.
The Health Service Executive (HSE) has a page on travel
where you will be able to find a reference to self-isolation and the passenger locator form which you will need to fill in as you will be in the State overnight. Wherever you stay overnight, you will need to avoid contact with others, please have a look at our approved accommodation
search page for detail of hotels at Dublin airport. We would suggest contacting them to see if they are open and the facilities available to you when self-isolating. You will need an accommodation address prior to arriving for the locator form and you are not required to stay for 14 days.
I hope this helps and that you can continue your time in the Schengen Zone and maybe, when self-isolation is no longer required, come back and see all the we have to offer! :)