Our stay at Gaston's place has been wonderful! After two month traveling between hostel and dormitory we were looking for a nice place to stay and we found in there more than what we needed! Everything was clean, the kitchen is nice and fully equipped, the bed is really comfortable and the bathroom nice too! The area around the building is totally safe and near to everything in the city center, very easy to get wherever you want with public transport (gaston left in the flat two SUBE card to use bus and subway, you just need to charge money).
Just the perfect place to stay in buenos aires!