I feel like this place is a funky dive bar - way cooler than a 'tavern' as the name implies. It feels like the kind of place that should have a pinball machine, even if just for decoration.
We went here late on Friday night (1am-ish) for a night cap after walking into Molly Malone's and Side Street and being a bit unenthused by the clientele and music choices. Oak Tree was a welcome change with it's softer tunes, ability to have a conversation, chilled out vibe, free tables to sit down at and decent beers on tap. It's also the only bar that I've been to where they haven't been playing sport on the flat screen TV (Princess Bride was screening last night).
The waitress came over to the table straight away and was super friendly. They don't have many beers on tap here (5 or 6) but they have a Black Lager by Last Best that I really like, and I much prefer quality over quantity. Plus I love that they have booths, because I'm lazy and like to sit in comfort.
I didn't have food here this time given the time of day, but I sampled some of their new menu last month and was a fan of whichever burger I had and the spicy tuna poppers. And now I'm hungry...