I love Buenos Aires for nomad life. The city feels alive. Cafés buzz, tango spills into the streets, and parks are full of people. Summers get hot. Winters are mild. Most travellers enjoy the late nights and cheap, tasty steak. For some, the noise and bustle will be amazing. Arguably not the best if you need total silence.
Cost wise it is friendly for many foreigners. You can live well without breaking the bank, though prices do jump sometimes. Internet is solid in coworking spaces and many apartments. I once worked from a café in Palermo while a street tango show happened outside. That kind of day sticks with you.
There are coworking hubs, meetups, and language exchanges. Things to do are endless: street art walks, fútbol matches, day trips to Tigre, and long café afternoons. The digital nomad community is active and easy to find. Come curious and expect surprises.