Purchase advice Fiat 500

Hello everyone, I just signed up here because I need some support when choosing a Fiat 500. This should be for my mother and I’m doing a little bit hard. It should be a leg pin & switch that is not older than 2015. Special equipment should have panoramic roof, Bluetooth/MP3, navigation system and climate control. And I have a few questions: 1. Is the Fiat 500 switch the better choice? I read that the automatic is not correct, j But better than that of the Smart. The dealer advised me to the switch. 2. What is the Fiat navigation system like? Is it worth the extra charge or is a mobile navigator enough? 3. I assume, as with every car, that the air conditioning system is much more pleasant than the air conditioning system and you should definitely have it? 4. As I have noticed, there is no seat heating from the plant, can you retrofit it cost-effectively? If I have something else in equipment or especially on something a Thank you very much for your help.