If you have a car, then I wouldn't stay in Dublin -- particularly if some event is taking place.

Speaking from personal experience:

In the past, I've stayed at the Premier Inn Dublin Airport.  The have free parking and are located close to the #41 Dublin Bus stop and the Swords Express Bus stops right in front of the hotel.  A test booking for 19 May shows a two-night minimum at a total price of 170 Euro (prepaid).

I've also stayed in Bray a couple of times.  You can take the DART into the city from there.

The Esplanade Hotel is nice enough. They're quoting $200 for 19 May:  http://www.esplanadehotel.ie/

We've also stayed at the Old Rectory B&B and found it pleasant (if a bit difficult to locate originally):  

https://www.booking.com/hotel/ie/old-rectory.html

You can also check out Michele's List for Dublin:  http://www.irelandyes.com/lodgings.html

We stayed at Beechwwod last trip in Malahide, I had already contacted Terry and he will be away on vacation
5-16/5-28.
I've looked into a couple of air bnb' ...I've used them often in the states but never in Europe. A 15 minute bus ride from Dublin offers a detached private bedroom- private bath and king sized bed...and free parking for our car. I'm thinking perhaps...55 euros seems like a steal - I imagine it's just like using air bnb in the states.Have you heard of anyone's experiences?