The Air Link is an excellent bus service that runs every 15 minutes from Dublin Airport. It costs €5 single. Exit at Ormond Quay. From here it is a 3 minute walk.

Directions to Fitzsimons from Ormond Quay.

Walk East along the River Liffey, you will pass Capel Street Bridge continue along the River until you meet the next Bridge which is the Millennium Bridge. Cross the Millennium Bridge and you are there.