1) The wine. Of course.
2) Food: all types of meat, empanadas, pastas, croissants (media lunas), dulce de leche, ice cream, coffee
3) Sunshine and warmth. It is almost always sunny and warm when I show up and I leave before it gets really cold. I once saw a picture of Mendoza under snow and the thought never properly registered in my brain. I have lived here so many times and it has always been warm. It is weird to think of it otherwise and I refuse.
4) The asado. All of Sunday everything is closed and you are forced to spend the day with family and friends taking it easy. If I were better at taking naps, the siesta hours would be on this list as well.
5) Music: tango, techno tango, music in the plaza, at the bars, you name it.