Club Café Sarecka. I’ve no idea why it’s called a club, but it’s a very nice little cafe. Just one more place in Prague 6, right off of Vitezne namesti just a block off the square. It underwent renovation, and name change a couple of years ago, and has a nice quiet upstairs with two electrical outlets for plugging in and a pretty good Internet connection.
At Na Hutich 9, it’s connected to the Prague Duck Restaurant next door. Check the map for the location.