Travel Note
Uber, Bolt and traditional taxi's are ll reputable and easily accessible. If you're coming from the USA you'll likely find it easier to use your Uber app. You can also download the Bolt app, and it works just the same.
Travel Note
Myself and a lot of other people have found Apple Maps works best when trying to get around both for walking and public transportation in Europe. It's great at getting you around via walking, metro, buses and trains!
Travel Note
You can purchase tickets for buses/subway in any metro station. When using buses, if you don't have a ticket, you can pay on the bus but make sure to have cash!
Travel Note
Most people use physical credit/debit cards to pay at most places (including markets). But the majority of people in Europe use Apple/Google pay directly from their phones. Make sure that's set up so you have a backup option for worst case scenario (you lose a card). APPLE PAY from person - person will not work in Europe but you can still use Zelle.
Travel Note
If not using your American phone carrier's international data plan, I strongly suggest downloading one of these apps: Airalo or Holafly to purchase international E-sims that can be downloaded directly onto your phone. You can purchase the amount of data/wifi you will use on your trip. Depending only on public wifi would make your trip incredibly difficult.