Luca is a fantastic host, I highly recommend staying with him! Not only did he provide a gorgeous and comfy 'home away from home', but he also offered great advice on all the nooks and crannies you will want to check out in Dublin.
The flat itself is perfectly situated; most 'attractions' (Temple Bar, Trinity College etc.) are in walking distance, but there are buses/bus stops galore nearby if needed (and Luca can point you in the right direction re public transport).
I only stayed for two nights but wish it had been longer, truly a smashin host, home, and city.