Bloomfield has some hidden gems and Nico's is one of those kind of places that is getting less and less common around the 'burgh. It's not a gastropub, it's not bohemian, Nico's is just an old time bar/restaurant that makes me nostalgic for a time before I was even born.
I always come here on Monday nights for the wing special. It's something like 24 wings for 8 bucks which is not a bad deal. There are definitely better wings around the city, but I still keep coming back to Nico's. Maybe it has to do with the friendly atmosphere (seems to be a family run place), and the divey feel. The location is great as it just pops up in the middle of a residential section in the heart of Bloomfield.
The patrons are always friendly, and on more than one occasion I've had random people start chatting me up like we've known each other for years. If you are feeling adventurous try out karaoke night on Saturdays, its always good for some laughs and fun times.
Long live the old school joints in Pittsburgh, I hope you last forever.