Not every model has air con.
It's standard on the 4x4's, Trekkings and Lounge's and was a option on Easy's, though they did eventually sell an Easy Air model, (Air for air con.)
Digital Climate Control I think is standard on Cross's and a cost option on 4x4's, Trekkings and Lounge's.
I don't think either was offered on the basic Pop model in the UK, though the windows do open!
You can spot models with it by looking at the fan speed control, if it has air, the knob will have a orange light on it and it operates by pushing the knob inwards when the fan in turned on to any speed.
Towbars are readily available and can be quite cheap depending on which you want.
Fitting is quite easy, it replaces the "crash bar" behind the rear bumper cover and just bolts on using the same mounts as that.
Some require a bumper cut underneath, but it's not visible.
A simple 7 way bypass relay is all that's needed for a single 7 pin socket, though the relay's live needs routing from the front of the car, there's no live pickup in the rear.
So it's a matter of routing a suitable cable through the car, under the door sill covers etc, into the boot.
There's plenty of space for the wiring behind the carpet, behind one of the rear light clusters.
There are also dedicated wiring kits that take some of the wiring hassle out of fitting, though they do cost a bit.
https://www.pfjones.co.uk/tow-bars/fiat-towbars/fiat-panda-towbars/fiat-panda-2012-on-towbars.html
There was a change in production for cars in early 2014 (around March, so 14 plates and onwards) to accomodate the latest Euro regs for the 1.2 petrol engine., which is by far and away the best engine for a Panda, it's robust, yet cheap and easy to service, it's also very reliable, smooth and offers all the power a Panda needs.
(the change didn't alter the road tax band, so both are still £30)
The change altered some driving charateristics and quite a lot of owners didn't like it, particularly repeat owners who knew how the older ones drove.
The main complaint is the fact the ECU takes over and increases the rpms a lot more when lifting the clutch in first gear, like a lot of modern cars do.
Owners can bog the engine down when it relinquishes control by inputting too much throttle themselves while it's in control of the revs, which can cause a bit of a flat spot, they can also feel a bit strangled and tight when you boot it, pre 2014 cars seem to rev much freer in my opinion.
Having or have had both a post and pre car, I can say I prefer the pre 2014 cars, though in slow shuffling traffic, the post cars can be a little easier to live with as they'll creep really easily on the clutch without any throttle input at all.
I would advise test driving both, see which you prefer.
I regards to the rear seats, most models came as four seaters, so only two rear seats/belts.
A three seat rear bench, with an extra roof mounted belt was an option.
Oddly enough there seems to be a glut of Pop's on the market with the three bench option for some reason.