I stayed in Bruno's apartment for 9 days, and had a mostly good stay. Check-in went smoothly, with Bruno being there to meet me. The apartment was very spacious, well-equipped, and quite clean, although it did look a bit old and worn. It has a lot of windows, but the location in the middle of the building, facing an inner courtyard, always makes it feel like a cloudy day, even when it's sunny. I also barely got any mobile signal inside the apartment, at least with my Claro SIM card. WiFi and hot water were reliable, however. The location in Villa Crespo was pretty good if you want to stay in a commercial area - Lots of shops, restaurants, and a few bars nearby, a short walk from the subway, and maybe a 15-20 minute walk to the lovely Parque Centenario.
Unfortunately, its hard to be objective about my stay when the electricity was out for almost 1 1/2 days, a problem that seemed to be specific to the building or a small area, but obviously this wasn't Bruno's fault. Bruno was good about responding to messages, and he always helped me when requested, but was not very proactive - For example, when the power was out, he didn't make sure I had enough light sources or check if I needed anything else. Still, if you want to have a lot of space and like the area, Bruno's apartment is a pretty good choice.