The venue of the meeting will be Villa il Gioiello, located in via Pian dei Giullari, 42 - Florence. Some historical and logistics information on the venue are available here:
Villa II Gioiello
Via del Pian dei Giullari
42, 5 0125 Firenze FI
Villa il Gioiello ("The Jewel") is a villa in Florence, central Italy, famous for being one of the residences of Galileo Galilei, which he lived in from 1631 until his death in 1642. It is also known as Villa Galileo (not to be confused with the other homes of Galileo found in Florence, which are in Costa San Giorgio, as well as a villa in Bellosguardo).
Some hotels nearby the Observatory are indicated in the following page: