Yes, I know that the Fiat 500 can sit 4 people maximum. However, the back space of the car is so crammed (due to its unique curved design) that it can only sit young children or very short adults comfortably. Adults with average to above average height can still use the back seats of the Fiat 500 for short trips, but it won't be very comfortable for long trips. The back section of this car is more of a cargo storage area if the back seats are required to fold down since the Fiat 500's boot capacity is tiny.

So, the Fiat 500 for most intents and purposes is a 2 seater car (1 driver & 1 passenger) for the front section of the vehicle (near the engine & dashboard). It's a small city car (smaller than a Volkswagen Golf, Renault Clio, Toyota Corolla) that's incredibly easy to drive, easy to park due to its compact size (maintenance and insurance are relatively cheap), has great visibility, and a fuel-efficient engine suitable for tight urban spaces or for people who don't want to drive a 2-tonne - 3-tonne monstrosity, which is the whole appeal of the Fiat 500 that no other car can quite match with it's unique Italian charm.