I would 100% recommend Matias's place! The area, Palermo Chico is amazing! It's really high-end but community area. There's a ton of amazing restaurants and few good bars close by. I loved having access to Crossfit and Bikram - as these were only a 1-3 minute walk from the house. The parks are also super close by - a great place for a run. You're in a quieter part of Palermo but you can walk to Soho within 15 minutes (which I did every day.)
The apartment itself is huge. It's the whole floor and the room itself is massive. You have a lot of privacy but also a few spaces where you can cross paths with Matias and other guests. I work online and was able to take calls from the living room. The internet is not the strongest in the bedroom but it's perfectly fine for normal work. Matias made a huge effort to ensure the internet was great - this is super rare in Argentina. Sometimes the internet at the house was better than at the coworking space!!
Overall, I couldn't recommend this place enough. The value is absolutely amazing - you'll be in good company, in one of the best parts of Buenos Aires. I will certainly be staying here again!