Augustina and Sandra's place in San Telmo is a dream. The location is perfect, very walkable with lots of places to eat nearby. The apartment is stylish and comfortable while still being cozy. We loved the balcony and the big french windows.
The only caveat is that you can hear the traffic at night, so I would suggest bringing ear plugs.
The hospitality was great, from early communication after booking, to the check in process (Augustina waited for us even though we got there after 9 pm) and letting us leave our luggage for the day after check out.
All in all, an amazing value for money in Buenos Aires!