What function does "yhdessä" play in this sentence
I came across this sentence in Speakly: "Minä olen keskustassa yhdessä kahvilassa", which is translated as "I'm at a café in the center".
I would expect the sentence without "yhdessä" to have the same translation, so what information is it providing that is missed in the translation?
It makes me think the speaker is with someone, but the translation doesn't suggest that.