After extensive research, we could not verify the existence of a café named "Mostra" in Athens' Syntagma/Akadimias Platonos area. The search results only show a San Diego-based coffee roaster with the same name. Without verifiable information about a local Athens venue, we cannot provide an accurate City Insiders take.
Venue Not Found
After multiple searches in English and Greek, we were unable to locate any café named "Mostra" in Athens, specifically in the Syntagma or Akadimias Platonos neighborhood. The only "Mostra" that appears in search results is a specialty coffee roaster based in San Diego, USA. There is also a bar called Mostra in Milos (an island), but nothing in central Athens. Without verifiable information about a local venue, we cannot provide a meaningful review. If you're looking for a café in this area, you might want to double-check the name or consider exploring the many excellent cafés that do exist in Syntagma, such as Public Cafe Restaurant or other highly-rated local spots.