My office is room 4.15 in the 7--9 South Leinster Street, which is just off campus , about two doors down from the National Gallery, and across the road from the Make Shop. It's the same building that the Careers Advisory service and the Student Counselling Service are in. If you're coming to see me I suggest you put it in my calendar to make sure I'm there and available -- I'm trying out this online calendar which let's you confirm a time that suits us both.
You can telephone me on +353 1 896 3629 (this number has voicemail, and I do check it).
Good old snail mail works, too
School of Computer Science and Statistics
Trinity College, Dublin