The Mazda3 is a popular car for teens because it is a 4-door that has modern styling. It looks sporty even in base trim.
Braking is more than adequate for the car. The car comes equipped with front driver and passenger airbags and optional rear airbags. NHTSA gives it a 4 start rating.
For a small car there is more than adequate leg and shoulder room for two average sized adults.
A new, well equipped S model comes in well below $20000. This compares well with other cars in its class with similar features and performance.
The depreciation is very low as one year old models with average mileage demand a premium compared to other cars in this class. Insurance is relatively low given the safety features and ease of repair.