Aqua is basically a daily commuter car made for congested areas in Japanese cities. Its seats 2 adults + 2 children with decent boot capacity.
When you buy Aqua, pls compare it with Vitz or Passo not a sedan.
Aqua Hybrid is renowned for its fuel efficiency, so you should not expect it to be a rocket.
I have a 2014, its very smooth even the transition between EV and ICE. I have to use horn to warn pedestrians.
Only the accidental cars have noise and problems.