Learn Portuguese (Portugal): O gato está na sala, no sofá. - The cat is in the living room, on the sofa.

Both are made by combining the preposition em with a definite article. Sala is a feminine noun, so em combines with the feminine article a to make na. Sofá is masculine, so em combines with the masculine article o to make no.

Does the same word really mean both "in" and "on" here?

Yes! In Portuguese, the base preposition em (and its contractions like na and no) covers "in", "on", and "at". You rely on context to know that the cat is in the living room (na sala) and on the sofa (no sofá).

Why is the verb está used here instead of é?

Both mean "is", but they are used differently. Está comes from the verb estar, which we use for physical locations and temporary states. Because we are talking about where the cat is right now, we must use estar.

Why does sofá have an accent mark on the last letter?