Christian's place was nice and clean and the shower/sinks/appliances all work great. Just as a note to others staying here - you may have to turn on the heater in the bedroom, we didn't see there were switches on the outlet for it the first night.
There are several units in the building and when I arrived there were other airbnb'ers struggling with the button combo lock. You just have to be patient if you enter the wrong code as it takes longer than you'd think to reset. Then after you enter the correct code you have to wait until you hear the lock actuate before trying to open it. Christian provided good detailed instructions but it's easy to just skim them for the code and assume it's easier than it is.
The location is about perfect.. It's right next to the Guinness Storehouse but a bit of a walk from Temple Bar zone so it's easy to get to all the touristy stuff but nice and quiet at night. I recommend walking to Brazen Head for a pint (Dublin's oldest pub apparently) and taking the train to Howth.