The very fast internet connexion and Netflix was very important for me since I have stayed for 3 weeks. Safe neighborhood, went every morning at 8:00 o clock to Cafe Martinez on Boulevard Charcas (100 meters walking). Excellent quality coffee with fresh just made warm medialunas (croissants). Very good wifi here as well. if you want to was your clothes, there is a Laverap on the same street (Bulnes]. Normally leave your dirty clothes and will be ready the next day for about 470 pesos.
Lots of bakeries, supermarkets and restaurants in the area. Subway station Bulnes 100 meters walking (this is a huge plus;to quickly move around in Buenos Aires). Just make sure to purchase your SUBE card and charge it with a few hundred pesos. Each trip costs 30 pesos today.
Enjoy your stay, be safe!
Hernan