We had cruised the Caribbean 5 times (including Cozumel) and preciously visited Puerto Vallarta (1982) and Cancun twice to all inclusives with the grown up kids. But this was a different way to see Mexico that appealed to us, it being Valentine's Day and everything (my 60th birthday on the 13th).
We found our aft cabin, B256 cramped and noisy. Our steward was fine, he needed some time off. I love the food but my wife just gets by with it. Sometimes she liked it but she liked less of it than I do.
We had one of the best excursions ever in Puerto Vallarta with Valarta Adventures through Princess. We got WAY more than we paid for with snorkeling, kayaking, a hike, a waterfall, a beach, a close whale encounter, great food, drinks, and entertainment. Highly recommended.
This cabin is tight for two people. The balcony doesn't make up for it. Being aft on this ship is not a huge disadvantage, the whole ship layout is a mess. There was a fair amount of machinery noise along with the wake. There often was a nasty kitchen smell you had to ignore.
Not much of a stop when it is this short. Nice place, though, and it would be someplace high on my list to visit for a week or so. Maybe..
The old city is extremely walkable from the ship. HIGHLY recommended you do this and see the historical part of the city on-the-ground.
An extemely commercial port but functional and not at all dificult to get to ($35 or so on Uber - great!).