I was very impressed with Tango. As expected, the menu features lots of meat dishes, but I was very pleasantly surprised by how well my steak was prepared and how much flavor each bite had...even without the sauces or cheese.
In addition to great food, there was a wonderful small trio band playing Bossa Nova and Argentinean songs. The lead singer Lizje has a spectacular voice.
Tango may be a bit far if you are visiting Boston, but if you are in Cambridge.. you might want to consider a trip to Arlington for a great meal.
My one small critique... you can't really hear the band at the tables. We had after dinner drinks at the bar after dinner just to hear and really appreciate their performance... it was well worth it.