The location was perfect, very close to transportation and walking distance to many landmarks, cafés and supermarkets. The apartment felt a bit small, but for two people to stay for a few days, it's ok. Everything was clean when we arrived, with the only issue being a slow shower drain, which would leak onto the floor outside the shower. No amenities (salt, sugar, coffee, extra toilet paper/paper towel, etc.) are included in the apartment, so plan to buy or bring everything you need.
We didn't meet Antonino, but were mainly in contact with Giuseppe, who lives next door in an adjoining apartment. The studio we stayed in seems to be an extension of Giuseppe's apartment (they share a front door). This layout really makes it feel like you are staying in a private room vs having an entire apartment to yourselves, and the walls are very thin so you can hear every bit of noise coming from next door. Also, Giuseppe and his wife knocked on our door at least once a day during our stay to ask a question or give us information that could have easily been communicated by SMS or email. All of this combined made us feel like we didn't really have any privacy during our time at the apartment, which took away from our experience.