The shops and galleries I recommend, plus the ones the artists sent in. Most of it sits in three clusters you can do on foot in an afternoon. Every “walk there” link gives you walking directions from wherever you are.
All of these are a walk from the house.
Four doors within a couple of streets of each other.
South William Street and the lanes off it.
Across the river, or a stop or two on the tram.
Check opening hours — the smaller galleries keep short weeks, and most are closed Mondays. IMMA and the Hugh Lane are free.