A few questions before coming to Szczecin

My friends and I are coming to Szczecin for 5 days very soon and since it’s our first time coming to your city I would like to ask you some questions so you can hopefully help us out.

1. Money- how much cash would you recommend to carry since I already read somewhere Szczecin provides paying with cards pretty much everywhere. also very important- where can we safely exchange € to zloty?? What should we watch out for when exchanging money?

2. Food and drinks- if you can recommend any bars, restaurants, breakfast places, certain dishes to try out we will be more than happy to. We will definetely eat and drink out at least once a day

3. Transportation- what is the best type of transportation to get around the city. What apps/websites should we use to get the best deal and do you recommend buying a single-use ticket every time or is it worth it to buy a 7 day lasting ticket?

Also, we are traveling to Szczecin from Berlin actually so if you can recommend what is the best way to arrive please help us out

4. Are there any dangerous parts of the city that we should avoid?

5. What are some of the not-so-tourist places worth visiting (streets, museums, galleries etc.)