America del Sur is definitely a great hostel in a great location in San Telmo! The staff was so helpful with whatever we needed. Great breakfast. Real nice social areas. We were able to walk around a lot to get around and the staff helped us with the bus lines for places that were a bit further. Very clean and secure building. Near lots of restaurants. If you're coming to San Telmo, stay here, you won't have any regrets!
We had a nice stay at Pocitos. Although their directions via bus were a bit off, that probably comes down to English translation. Taking Bus XX "to" Carretas is COMPLETELY different than taking Bus XX Carretas (opposed to Bus XX Zonamerica). Neighborhood was good. Hostel was definitely a social hostel. There was a gal's birthday and there was a party there one of the nights. Got a little rowdy. Staff was helpful with our needs. We'd definitely come back!
We only stayed one night, getting in late. Staff wasn't too helpful when we arrived, but perhaps part of that was due to when we arrived. Clean, nice social area. A little bit off the main road of the center, but a short walk to get there. A super market close by to get groceries.
We had a great couple day stay at SoHo in Palermo. Anapaula was very helpful giving us information on the area. Standard breakfasts, clean & a safe area. Lots of restaurants and shops within walking distance. Not a party hostel, but that was certainly alright with us. We would definitely come back for another stay!