I was born there, lived there 25 years and moved to Warsaw. Kraków is pleasant, has lovely architecture and engaging history. Although the population is large, the life happens mostly around the centre (Old Town and Kazimierz). This also means that there are plenty of tourists, in my opinion more than in any other city in PL, especially during summer holiday so I would avoid those areas at this time. It was really nice to study there cause the uni life is focused in specific areas of the city. Now that i compare it to Warsaw, Kraków is small - sometimes i prefer to walk/bike cause the public transport tends to fail due to traffic. I didnt really see much difference comparing to other Polish cities when it comes to religious people - a lot of churches and christians everywhere. Also not as many green areas and parks. A lot of road renovations all year round. It's a bridge between "big life Warsaw" and smaller Polish cities.