Luggage Storage Siena Railway Station

It was very convenient to have luggage storage at the train station (the official trenitalia site says there is none.) The online reservation for our bags was easy. However, I spent over an hour trying to find the location! The geolocation feature in the app gives a location in the shopping mall across the street from the station (incorrect!). There should be clear instructions about where this service is located. As you enter the train station main door, the baggage drop is in the small "convenience store", in between the door to the platforms and the coffee shop on the left. Show the cashier your reservation receipt and leave your bags with him/her.