Having spent some years in Chicago, I am less than overwhelmed by the number of Irish patrons in relation to Irish-Americans and the other general Seatteites at Kells, but I am impressed by how the Celtic spirit and pride are still strong. I've seen people break out in song--well, sing along to the more popular Irish folk music that they play--and I've seen some pretty adorable older people dance on the limited floor space. I've also been there on weekends when music wasn't playing and the place seemed just like two rooms full of dark decor and endless rows of tables. On the less lively nights, Kells turns into a pretty standard Irish pub with less-than-comfortable seating, which I guess is standard Irish pub.
The pasties and sausage roll are buttery and delicious, although small (that may be the intended size, but I found it a little expensive for what it was). The beer list has some recognizable Irish and English drinks, but it's not particularly long. When the weather is better, there is limited patio seating available.
Located in Post Alley, Kells is nearby a lot of the downtown action. Parking is, thus, at a premium.