I work just beside these apts. so know the area reasonably well.
Generally speaking the area is fine (granted I'm only here Mon - Fri, 9 - 5). I don't know if you know Dun Laoghaire - if you do, you will will know that it's not as well to do as some of its' other southside neighbours e.g. Glasthule, Monkstown etc and the HSE have a methodone clinic here so that doesn't help...
However, I've been working on the same street as these apts for ten years and I've never experienced any problems...
These apts have been empty for a long time about 18 months so you should be able to negotiate a good discount on them...
Im not sure if any of this infomation helps you - have you any specific questions?