Breakdown of Estou no quarto.
estar
to be (temporary / location)
no
in the / on the / at the (m, f, pl forms: na, nos, nas)
o quarto
the bedroom / the room
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Questions & Answers about Estou no quarto.
Why use estou here instead of sou?
Where is the word for "I" in this sentence?
What does no mean, and why is it used instead of em?
No translates to "in the". It is a mandatory contraction (combining of two words) of the preposition em (in) and the masculine word for "the", which is o. Because quarto (bedroom) is a masculine noun, we must combine em + o to make no.