Hotels
The Central Hotel
This venerable Dublin institution is located right next door to the wedding venue. We've block booked rooms, so if you'd like to reserve a room there, just email info@centralhotel.ie and include "For Isobel's attention" and mention our wedding. They should be discounted off the public rate for Thurs, Fri, and Sat (Sept 26 - 28).
1-5 Exchequer Street, Dublin 2
centralhoteldublin.com
Kelly's Hotel
Also quite close to the venue and accessible to a bunch of restaurants, bars, and attractions on the south side.
36 South Great Georges Street, Dublin 2
kellysdublin.com
The Mercantile Hotel
The Mercantile is also just a few blocks from the venue, and closer to the Temple Bar area... if you dare.
28 Dame Street, Dublin 2
mercantilehotel.ie
Airbnbs
Various Airbnb options
Some of the best value accommodation in Dublin is probably found via Airbnb. There should be a number of places within a short walk of Fallon & Byrne / Grafton Street, and the area is a fun place for sightseeing and food.