My husband and I stayed for 3 nights at Hollybank B&B at the beginning of december 2014.
We bought a 72-hour Dublin Visitor Leap card at the public transport counter in terminal 1 of the airport. This allows you to take all the busses, (wave the card in front of the validator in the front of the bus when getting on and getting of the bus), and also the tram-like Luas (touch your card on/off at the validators on the platforms) and the Dart Commuter Railway system (touch on/off at the gates). The 72 hour period starts after your first validation of the card. Details on the website under FAQ - Tourist information.
We took bus n° 16 from the airport to Lower Drumcondra Road, which takes about 15 minutes. The stop is across from Fagan's pub (most Irish are more familiar with names of pubs instead of streetnames). Hollybank B&B is just around the corner.
There are plenty of busses going to/from the centre, which takes about 15 to 20 minutes depending on traffic and where your want to go.
Siobhan and George proved to be very cheerful, congenial and helpfull hosts. Siobhan gave us useful tips about which busses to take, possible places to eat, and she gave us 2 of her own glasses for the champagne we brought along to celebrate my birthday.
Siobhan also cooked a delicious and plentifiul Irish breakfast on our first morning. The other mornings we chose to have a lighter continental breakfast. Breakfast is downstairs in a separate room, with several tables. There is a minifridge with juices, milk and yoghurt, and there are several kinds of cereal, but Siobhan provided us also with toast, marmelade, cheese, scones or even porridge, coffee and tea, and plenty of laughs to go with that.
We stayed in the pink room on the first floor which has a comfortable double bed, a cable tv, and a private bathroom with a shower, small washbasin and toilet. The bathroom isn't very big, but sufficient for a short stay.
The room was very clean and quiet.
The Botanic Gardens are very close (entrance is free, and they are worth the visit if you have some spare time), and there are some places around to eat dinner, but we dined in town.
We had a fantastic stay and will stay here again should we visit Dublin once more.