Should I try to learn basic phrases?

Yes. Knowing 'Hello', 'Thank you', and 'Sorry' in the local language goes a long way in showing respect, even if the rest of the transaction is done via gestures.

What if they start speaking very fast?

Politely hold up a hand, smile, and say 'Slowly, please' or point to your ears and shake your head. Most hotel staff are accustomed to international travelers and will adjust.

Is it rude to use a translation app?

Not at all. It is often appreciated because it reduces errors regarding your room preferences or arrival details.

Check-in at a hotel when you don't speak the language

Have your confirmation number, passport, and credit card ready in a single folder before you approach the counter. Use a translation app for specific requests, but rely on basic keywords and non-verbal cues to streamline the process.

Prepare your documentation packet. Do not fumble for papers while standing at the desk. Keep your printed booking confirmation (or a screenshot), your passport, and the credit card used for the booking in one accessible folder or an open tab on your phone.
Lead with the essentials. Walk up to the desk, smile, and say "Hello" followed by your last name. Place your passport and confirmation on the counter. If you have a reservation, they will understand the context immediately.
Use the 'Point and Confirm' method. If the clerk asks a question you don't understand, point to your document or the computer screen. Use a simple thumbs-up or nod to confirm you understand the basic check-in procedure (signing papers, receiving keys).
Translate specific needs only. If you need something specific like a late checkout or a quiet room, type the request into a translation app (Google Translate or DeepL) beforehand. Show the screen to the clerk rather than trying to speak the translated phrase aloud.
Confirm the basics manually. Always confirm the check-out time and breakfast hours by pointing to your watch and asking "Time?" while gesturing to the dining area or your keys. Write the numbers down if necessary.

Should I try to learn basic phrases?: Yes. Knowing 'Hello', 'Thank you', and 'Sorry' in the local language goes a long way in showing respect, even if the rest of the transaction is done via gestures.
What if they start speaking very fast?: Politely hold up a hand, smile, and say 'Slowly, please' or point to your ears and shake your head. Most hotel staff are accustomed to international travelers and will adjust.
Is it rude to use a translation app?: Not at all. It is often appreciated because it reduces errors regarding your room preferences or arrival details.