Kind of a nice article focused on Orvieto in Umbra, but mentioning other cities in Italy and the spread of the Slow Cities movement around the world.
"The miniscule Tuscan Chianti town of Greve became the first "cittáslow" in 1999, followed by Bra, Positano and Orvieto. Over time, the slowness wave has spread. There are now 42 slow cities in Italy, and more and more cities -- in Great Britain, Spain, Portugal, Austria, Poland and Norway -- conform to the movement's list of strict requirements. In Germany, a number of cities -- including Hersbruck, Lüdinghausen, Schwarzenbruck, Waldkirch and Überlingen -- have joined the select circle, which only admits cities with fewer than 50,000 inhabitants." Spiegle OnLine.One of these Italian Cities would be great for a Slow Yoga Retreat -- especially Bra because that is where Slow Food started and Greve, because it is so close to Florence and so charming.
Its probably possible to find a place within biking distance of Greve.