At the Festivalito venue, there are bedrooms to host to up 20 people in very comfortable accommodation which includes a big and tasty traditional Full Irish Breakfast! You wont be hungry after this! Towels are included but you share bathrooms with your neighbours.
There are 4 single rooms and 8 twin / double rooms.
Single rooms are €45 per night.
Double or Two-bed rooms are €35 per person per night.
You must book the rooms in advance when you register for the Festivalito but you pay directly to the reception upon arrival.
There are lots of cheap B&Bs and hotels nearby also.
eg: I did a search and found within walking distance:
1. The Regency Hotel which has a full leisure centre/spa.
2. The Skylon: http://www.dublinskylonhotel.com/
The B&Bs are:
There are two B&Bs in the area which are offering accommodation and are prepared to serve a late breakfast or charge a cheaper rate for room only: