Europe's electrical system is different from ours in two ways: the voltage of the current and the shape of the plug.
American appliances run on 110 volts, while European appliances are 220 volts. Most gadgets are "dual voltage," which means they work on both American and European current. If you see a range of voltages printed on the item or its plug (such as "110–220"), you're OK in Europe. Some older appliances have a voltage switch marked 110 (US) and 220 (Europe) — switch it to 220 as you pack.
Even older devices (and some handheld gaming systems) aren't equipped to deal with the voltage difference — you'll need a separate, bulky converter. Consider replacing your appliance instead — or doing without it in Europe.
My preferred (and Wirecutter's recommended) travel adapter (does not convert voltage): EPICKA Universal Travel Adapter
Another EU-specific option: TESSAN International Power Plug
Confirm that your phone will work in Europe. Nearly all newer phones work fine abroad (as do older phones purchased through AT&T and T-Mobile), but it's smart to check with your carrier if you're unsure.
Research your provider's international rates. Plan pricing varies wildly by carrier. Call your provider or check their website for the latest pricing.
Activate international service. A day or two before you leave, log on to your mobile phone account or call your provider to activate international roaming for voice, text, and/or data (whichever features you plan to use), and sign up for any international plans.
Cancel international service when you get home. When you return from your vacation, cancel any add-on plans that you activated for your trip.
The villa does not have the capability to do laundry. If you plan on doing laundry on another leg of your journey, be aware that most places in Europe do not use/have dryers.
In our experience, most places in cities take card/Apple Pay/Google Pay. There are exceptions, but we typically carry less than €100 at any given time. The farther you get from large metropolitan areas, the more you will likely need cash. Check with your bank to know if you'll have any foreign transaction and ATM fees and if your debit card is able to withdraw abroad.
You do not need to be scared about traveling in Europe, but you should be cautious and aware of your surroundings. Americans are often easily identifiable and can be seen as easy targets for scams and pickpockets. Travel wallet belts, keeping valuables in front/zippered pockets, maintaining awareness in incredibly crowded areas, etc. are all great ways prevent losing things.
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Books we love: A Court of Thorns and Roses (5 book series)
Spotify Playlist: Zach's Top 50
Comfort Movies: Paddington 2 and Pride & Prejudice
Bingeable Shows: Avatar: The Last Airbender and I Think You Should Leave
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Our inspiration to get married in Italy: Por Ti Volaré from Step Brothers