Ruy's apartment was exactly as described. It's in a beautiful neoclassical building with a charming, old-school elevator. The street feels fairly residential, but its central enough that it was the perfect jumping off point for tourist sites in San Telmo and close enough to northern parts of Buenos Aires (eg Plaza de Mayo and Recoleta). It's a great value to have your own space and the balcony was nice. On a personal note, Ruy was incredible welcoming (as was his mother who I met briefly while I was checking out). He was quite flexible with my slightly earlier check-in, where I was able to leave my bag at the apartment. He was also very accommodating around my check-out, flexible with time. They are both very easy to communicate with - Ruy spent several years abroad between the US and Europe and speaks fluent English.