Hi! I drive a Marbella, bought it with 145/80r13 winter tyres on the original 4,5x13 ET45 rims.
As I know: Original sizes are 4 or 4,5x13 wheels and 135/80, 145/70, 155/65, or 155/70 13" tyres. Diameters are from smallest to biggest: 155/65-145/70-135/80-155/70
They were worn or got flats after many miles, so got reallly cheap... a set of 155/80r13 summer tyres on 5x13 ET48. Front it was fine, but rear it was too inside and at bumps the tyre reached the chassis, so I wore them off on front, while had the 145/80r13 rear. I drive sometime harsh, but had no problem.
Had once on rear a pair of 5x13 ET38 Fiat 131 wheels saved from my dad's old car with 135/80r13 summer tyres (was a bonus for the car). Was fine, and looked really good, but got problem with age and rust, didn't kept the air for too long.
She had once temporarly VAZ 2109 wheels (4,5x13 ET40 about) at front with 165/70r13 summer tyres. They were ok, but I think a bit wide for an avarage Panda/Marbella.
And for winter (here in Hungary) I bought Cinq 4,5x13 ET35 wheels with 145/70r13 winter tyres. I still use them, they are surprisingly quiet and keep well enough in corners.
I have a 14" project, so testfitted dumped 165/70r14 summer tyres on 5,5x14 ET35 wheels. On front when turning, it can reach the chassis before doors, and on rear they reach the plactic side covers. Plus She lost a lot of torque.

I got a set of cheap and used 155/65r14 summer tyres, I'll put them on for summer.
Conclusion for me: With 145/70r13 she is slower than the speedo, but responsive and bit quicker.
With 135/80r13 she is still slower than speedo, but it's the original size.
With 145/80r13 the speedo is fine, and she goes well.
With 155/80r13 the speedo is perfectly correct ( at least by my gps), but she's a bit less responsive, but still goes fine.
SO, long story's short: For a daily driver I would use 145/80r13 on 4,5 (original) or 5" wide rim,
if someone wants more quick and grip than 155/70 on 5" wide, or even more grip, than 165/70r13

. Or 155/65r14 on 5 or 5,5" wide rim, and under ET40 but over ET30, so the speedo will not cheat much and will fit under the car.
If someone tuned the engine, than I would go up to max 165/65r14 or 175/60r14, since that's big enough and wide enough for a Panda/Marbella weight.

Sorry for the tons of lines, I hope I could help.
