First, I must say that Carlo is a great host. He picked me up from the airport, which no other host has even offered to me so far. In the middle of our staying he was interested if everything is fine.
A for the apartment, it is cozy, very well furnished, located in a residential neighborhood. The supermarket is just across the street.
If you're coming for an event taking place in Palacio de Congresos, Carlo's apartment is one of the best options. The Congress Palace is reachable in only 3 stops by tram or by 15-20min walk from there.