I’ve got a 2014 0.9 twinair convertible and I think it’s a great little car.
No problems with mine for the year I’ve had it, just servicing at about £100 a time and a couple of tyres.
I preferred the 0.9 twinair and from memory they come in two power levels, either 85 or 105. In 2014 they updated a few bits noticeably the speedo to a TFT screen which is much easier to read compared to our other family 500 which is an older 0.9 twinair hatch.
There were more updates from Fiat to the model in 2016/17 I think with a new dash and lights etc. Do a wiki search for more info.
I’m 6’4 and 100kgs and I share the car with our Aupair who is 5’4 and we both fit. I’ve got the higher power twinair engine and it really is powerful enough for anything I need to do, even with three adults and bags.
Free road fund licence on the 0.9 twinair model, low insurance, cheap servicing, a bit plasticy inside though. Convertible roof can be fully open on half open and it’s all electric so nice and easy.
On the pre 2016 cars there was an option to have a dash mounted portable sat nav unit - look for the little oval shaped port on the dash immediately left of the speedo housing.
I prefer to use my phone instead though (running Waze) as that works well in London, attached to a magnetic mount and with a cable to the Blue&me USB port (blue&me is worth having as I run Spotify with Waze through the car audio system.
Mine is an auto which I really like so can’t comment on the manual version. This car is so easy to drive with the auto - nippy and small enough to get anywhere.
Boot is a bit small on the convertible but I can fit most of a weekly shop in it and the back seats also fold down on mine to give more space.
The hatch version is surprisingly practical especially with the back seats folded down.
If the hatch version is what you are after then have a look out for the panoramic glass roof. This doesn’t open on our other family 500 (is fixed) but gives a nice airy feel inside.
Good luck hope you get a nice car for her.