You can easily fit a 2 and 4 year old in the back. It also depends on your height. I'm 6' 3" and there is not enough space for an adult behind my seat. But 4 average sized adults could probably fit ok. It's NOT a big car, it's rather small.
The trunk is also very small, so keep in mind that you could never fit luggage in there for all 4. For typical day to day driving, you would all fit comfortably.
The trunk is also very small, so keep in mind that you could never fit luggage in there for all 4. For typical day to day driving, you would all fit comfortably.