Rosario welcomed me personally, showed me how to use laundry, wifi setup, keys. She had a guidebook and bus guide, which was useful. She apologized for not having a cell phone available; said the last guest broke it. (There was a land line but I couldn't get it to work.) When I left, I emailed Rosario and asked her to get a radio cab to the airport for me, which she very kindly did. She had the doorman phone me to let me know. (Otherwise I never saw a doorman in the lobby.)
Overall the apartment was very nice, exactly as pictured but also with a small galley kitchen. Minor drawbacks: kitchen not so well equipped for cooking (how about a sharp knife, or scissors?), dining chairs not very comfortable. On the other hand, I really appreciated the staples in the kitchen: oil and vinegar, dried pasta, spices and coffee.
When I got there the weather was warm, so I enjoyed the balcony and bright, sunny atmosphere. Even on the next days, in the rain, it was warm and cheerful.
The neighborhood was not as nice as I pictured it--grittier than the best part of Palermo Soho, but that is just a few blocks away. It felt safe at night for this solo traveler, with many food shops and cafés nearby. Not so close to metro--about 5 blocks away, but I walked easily to MALBA, Japanese Garden, etc. from here.
I would definitely recommend it for one or two people.