The Gordon Art House IS as cute as the photos imply. The inside is open and airy, the rooms bright, and there is a ridiculously cool ladder to get up to the loft (which isn't as challenging to scale as an actual ladder; very stair-like once it's pulled out). The house is located near the Grand Canal, with all sorts of shops and DART access within a very short walking distance.
Aside from the house itself, Karen is such an accommodating host and genuinely fun person to spend time with, we decided almost immediately that we wanted to be friends with her (in the least fangirl way possible, truly, she's lovely).
The cafe across the street from the house on the corner makes a fantastic latte - not sure why, they're just better than most - and the ladies who work there gave us great daytrip recommendations which we ended up following with great success (highly recommend: visit Dalkey)!
Short version: It's awesome and we plan to return the next time we're in Dublin.