Thanks for your answer, Lourdes.
After reading your posts, I decided to hire at Sansovino because Borgo di Ognissanti is in ZTL, isn't it? So if I pick the car there, then I will have to enter the ZTL to return the car. It would be a justified entering, but I do not want to face risk of being fined, if rental car service does not notify authorities. As the idea would be hiring for three days and returning every evening to Florence, when car rental offices are already closed, I think it is more important to find a suitable parking. And following your suggestions, Sansovino parking seems great. Anyway, as I will have to reach the parking from the apartment those three mornings, it is not a big difference going to Sansovino one more day, the day I hire the car. In fact, if I hire and park in Sansovino it would be easier to return the car. Am I mad?
I have two questions regarding this, it would be great if you could answer me them:
1. According to their web sites, the Sansovino parking address is EXACTLY the same (Vía del Sansovino, 53) than the Sansovino Hertz office seems to have. Do you know if this is true? Do they share the same space? I have managed to find the Hertz office using Google Street View, but I have been unable to find the parking, unless they are together. Believe me, I have even written to the parking company with the questions (a friend has helped me to translate it into italian) "do you share space with Hertz?" and "Do you think I could find free space easily? Can I book ahead?". They have answered but, amazingly, they have not answered my main question. They just have told me this:
l' auto la puo' lasciare in sosta il tempo che vuole (€. 12.00 ogni 24 H ), non importa prenotare,nessuna agevolazione con Hertz posto tranquillo, il numero civico e' il 53.
2. Is it safe to go from the parking to our apartment on foot? I mean at night, around 21:00 or maybe 22:00. Google Maps states it would be a 25 minutes walk, that it not too much, but I am worried about it being dangerous somehow. If we have to get the tram it would absolutely ok, it is just wondering if we could save some money. :-)
Thanks in advance. I write looong and boring messages because I want you to have all the relevant information in case you are so kind to reply. Sorry!