I am at the town cafe in Spanish duolingo

Who is at the cafe in duolingo Spanish?

You should use quién, with the accent, as part of a question - ¿Quién está en el café?. Of course, there are some cases in which you can use the word "who" as part of a normal sentence. In this case, you don't need to use the accent.

How do you say why do you want to go to the hotel in spanish duolingo?

Why do you want to go to the hotel? (¿Por qué quieres ir al hotel?) We are close to the restaurant. (Estamos cerca del restaurante.)

Can you tell me the answer please in Spanish duolingo?

"¿Me dices la respuesta, por favor?" - Duolingo.

How do you say nice to meet you in Spanish on duolingo?

Mucho gusto en conocerle (or conocerte).