We absolutely LOVED our stay at Leandro's and Manuel's apartment. The location was great - close to everything you need - great restaurants, supermarket, subway, markets and other little shops. San Telmo is great just for wandering around and we always felt safe even at night.
The apartment was extremely well equipped. The boys had everything you would need. All the kitchenware was near-new and in good condition too - we cooked breakfast every morning in the apartment and ate out for lunch and dinner. The bed was super comfy (generally speaking we have found beds in south America to be really hard but not this one!). The shower pressure and temperature were great. The lovely big window was nice and the view was good.
Some people have complained about the traffic noise at night, we didn't notice it, it was more like a soft hum and definitely didn't keep us awake.
The doorman was a plus as it was easy to check in (at 11pm) and check out (at 4.30am).
The boys were great hosts. Very communicative and responsive, easy to deal with and available if we needed anything - they even dropped us off an extra blanket when it was really cold.
We would definitely recommend staying here.