I didn't find a dedicated thread for Tommy Nevin's, so I'll add to this, which seems to be one of the more recent.
After a meandering afternoon in the suburbs (got to the Botanic Garden just as the rain began so we instead killed a few hours drooling over kitchens at Abt), we headed to Nevin's for a late lunch. My BF had never eaten there, and it had been ages (10 years or more) since I was last there.
We each had one of their specials. The BF had a smoked salmon platter with brown bread plus the usual fixings (cream cheese, capers, tomatoes and onion, as well as some lettuce). He devoured it! I had a salmon BLT on rye bread, which was fantastic. I'd never thought about it, but smoked salmon and bacon go very well together. (My only nit, if I had to pick, was that it came with one fat slice of tomato when I would have preferred a few thinner slices.) Their homemade chips (crisps, not fries) were terrific, too...thick slices that weren't too greasy.
To drink: They pour a great Guinness.
As nr706 mentioned earlier, there's a group of musicians who gather there to play Irish music on Sunday afternoons, so we took a seat in the main room and enjoyed listening to them. One thing we both appreciated: They are there to socialize as well as play music, so they'll play a song then stop to chat with each other for 5 minutes. Because the breaks allowed us to talk to one another, too, I found that we actually listened to the music rather than letting it fade into the background.
Nevin's really does feel like a typical Irish pub on a Sunday afternoon (at least in the main room...football was on in the north room). If you walk into most pubs in the British Isles on a Sunday afternoon, you'll find them full of families enjoying their Sunday roast, having a pint, kids underfoot while the adults socialize. Nevin's has the same vibe, and is very family friendly (at least on a Sunday afternoon).