All COVID-19 restrictions were lifted in Ireland in April 2022. Foreign travelers are no longer required to quarantine or show vaccination documents. You can also walk the streets mask-free.
However, as with most countries in the world, Ireland still deals with COVID-19-related cases and deaths. So even if there are no more restrictions, it is still best to practice social distancing and safety protocols.
Other than that, Ireland is a generally safe country, with remarkably low crime rates.