Treehouse is a nice little Tremont staple. It has the old school bar meets trendy atmosphere and because the bar is split into smaller rooms it has a cozy ambiance. Oh - and there is a giant tree that sprouts from the middle of the bar, so that's cool.
The draft list is always decent and listed on a chalkboard to the right of the bar. Prices are pretty much on point to similar bars in the area. I usually come here for drinks more so than food but I would like to try out their brunch.
I like Treehouse and I come here pretty much whenever I'm in the area. It's definitely on the less pretentious side of what Tremont has to offer. The bartenders are always super friendly and I never feel like they skip over me when I'm trying to order which I wish I could say for most bars. The outdoor patio is pretty nice and spacious but the last time I sat out there some of the seats on the chairs were rusting away into the danger zone.