Martín is number one! Easy going, helpful, and fair. Quick to respond in the run up to my stay. I am doing a work about the culture of Buenos Aires and he had always gave me valuable tips especially about music. It also sent a lists of suggested great places to see and eat while i were there.
The apartment is in a nice central area, close to subway and Calle Florida, with many markets, good food and stores near. The place was clean, cozy, airy, with many books, hot water and air, the bed comfy, perfect WIFI and had everything i needed.
I definitely recommend the Martín's apartment, as he clearly run it as a professional operation. And a bonus! For those unaware he is musician and a good one, of the "El Limacoco"! See ya Martín.