Plaza Serrano is one of the two main plazas in Palermo Soho, known for its mix of nightlife, shopping, and weekend open air market.
There is a playground in the center for families visiting during the day. After dark, the bars come to life here for the younger crowd.
On weekends, there's a craft market here. I really enjoy it, it runs the length of the market and neighboring streets. You can find some fun souvenirs here if you take the time to look.