As airbnb expands (perhaps too quickly), my stay with Arturo was a reminder of the site's best self. At check-in, he toured me around before sitting down to annotate a city map with recommendations (speaking Spanish helped) relevant to my interests. This wasn't perfunctory "customization," like a hotel concierge -- since I was in town partly for research, for example, he pointed out a subject-relevant library which, somewhat unusually for Argentina, regularly acquired works from abroad. (It was a helpful coincidence that we're both in arts-related professions.)
The apartment itself is huge, if spare, with quirky little architectural details. I visited in the winter and found the bedroom to be a cozy spot at the end of the day, even without using the provided heater. Although we kept fairly opposite schedules, Arturo and I ran into each other in the kitchen on my last night, when he offered a dessert pancake which finally converted me to the cult of dulce de leche.
In short: a great experience, would stay again.