This is an all vegan café at the bottom floor of Kulturhuset (Stockholm House of Culture and City Theatre). The place is next to Sergels torg and the Central Metro station, i.e in the heart of Stockholm city.
Kulturhuset offers free wifi in the whole five floor building and there are seats for visitors placed out in the public areas, but there are no tables except in the cafés/restaurants - not even in the library! Restrooms are available at a fee, there are also lockers but they were out of order when I visited.
Kafé Plattan is the best place in the house for working/studying on a laptop, since they have some spacious marble tables with power sockets below the seats - enough room for both work and a "Swedish fika".
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