Really small and not hot looking take away bistro in Letná district. Just a few guys making pizza, but their margharita is honestly the best i have tasted in Prague. You can order various sizes (up to the maxi one, 60 cm) and types. They offer vegan and gluten-free options and every month they have some new special flavour.
Definitely one of the best options of eating if you're staying in Letná. You can just order the food at their web site (http://pizzaletna.cz) and they will bring it to you till 30 minutes. Or you can come around, buy a pizza and have a picnic in one of the near parks Letenské sady or Stromovka.
Margharita! You should also try one from the F.H.Prager lemonades, specially the rose hip one. And it's not possible to pay with a card.
Su: 11:00-22:00
Mon: 15:00-22:00
Tu-Th: 11:00-22:00
Fr-Sa: 11:00-23:00