all rental companies used that garage just outside ZTL

It is very easy to approach from the South of Florence.  You will completely avoid ZTL once you study well the map.   I do not know about from the North.

我們在羅馬港口 pick up our Budget rental，然後在佛羅倫薩歸還。我們在托斯卡納度過了 7 天，其中在錫耶納北部邊緣 Four Points hotel 停留了 5 天，作為遊覽周邊地區的基地。這個位置非常好，因為當您出去遊覽托斯卡納時，您完全可以避開錫耶納內的交通擁堵, plus avoiding ZTL.  Four Points is a modern hotel under Marriott banner.  Excellent breakfast for every guest when we stayed in Spring of 2023.  Drawback is there is no restaurant around except a pizza joint albeit a very good pizza joint.

要遊覽錫耶納和幾個山城，您可以將車停在城鎮山腳下，那裏通常有大型公共停車場。 然後，坐纜車上城鎮所在的山頂。 奧維耶多和錫耶納都是這樣運作的。阿西西 has a 5 levels garage set inside the hill.  After you park, you take a long funicular to the hill top.