Had a wonderful stay at Seamus's. The apartment is simple and no-frills, but it's a perfect base of operations for exploring Dublin—both the more central areas and other, less touristy areas.
Kitchen is small but fully equipped, though we didn't use it since Portobello is packed with wonderful places to eat and drink. Some highlights:
Grove Road was great for coffee and a light breakfast or lunch, and it's right across the little canal
Bretzel's Bakery, same as above though it's a little less "hip" -- but delicious bread.
Bastibe was a lovely (pricer) meal about a 10 minute walk—great place to sample the Irish "food scene." Great wine.
Forest & Marcy (sister restaurant of the harder to get into and pricier Forest Avenue) was also delicious for a fancier meal, really great wine as well.
Brother Hubbard was terrific for breakfast/lunch/brunch, excellent coffee, just a 4 minute walk from the house.
3fe, which is a good walk down the canal (15 mins) has excellent coffee, as well, though this location (South) does not have food beyond pastries.
All around a great trip. I much preferred Seamus' place/location to our last night in a much pricer, centrally located hotel.