Let me start to state this is was my first experience with Airbnb rather than the obvious hotels or which I also very much like: Agriturismo. I travel frequently for business purposes (only 4/5 star hotels) so consider by recommendation against this benchmark.

Pre-holiday/reservation contact: Giovanni is a very talented host who writes hospitality in capital letters! Instant/prompt feedback, courteous, provides any guest with lot of useful information (best places, transport, what to see and will assist in booking trips/taxis, etc. On top of all of this: he makes you very much welcome!

Arrival/stay: Although Giovanni could not meet in person, I was welcomed in a very ' Italian' way, with courtesy of the house and got the opportunity to talk on the phone. There were never too many questions or too much time asked. I consider professional hotels can learn from this experience. The apartment itself exceeds in many ways the pictures on the web (although is bit smaller than I anticipated) but exceeded my expectations on luxury (well equipped/full airco/full kitchen) provided. Very design-like/beautiful which I was very font of.
Garden is indeed incredible, with a well-maintained pool. A real value add to my stay. Unfortunately I did not use much of his guidance on public transport as I travelled on a rental scooter (also made possible by Giovanni) which makes Palermo and surrounding area very easily accessible.
Location: I consider the location of the apartment still to be a 'walking distance' however I cannot really recommend on this particular topic.
Departure: Only drawback was the end of my stay. Unfortunately I had to leave this wonderful place after 5 days. I can wholeheartedly recommend the apartment and will return if possible on my next stay in Palermo.