R M.
Yelp
Found this SMOKE FREE restaurant to be very pleasant and welcoming. Nice pretty waitresses serving an excellent selection of non-urquell beer. I found the people welcoming, I was there from 6:30-8 on a drizzling Tuesday. Tables about half full and filling up over the hour and a half I was there.
The menu seemed really fresh and seems to change weekly (I don't read Czech, but google translate helped). I had a very properly cooked steak with mashed potatoes in a Jameson sauce. I wanted to buy all the chefs a beer because the steak was so good (and I'm from the Midwest of the USA. And the beer... Oh the beer was great.
No English menus that I know of. I didn't ask. But the other options I remember were a single seafood ravioli, a starter of roasted apples with star-anise, risotto with prosecco and pecorino sauce, there was also a salmon filet, goulash w potato dumplings, slow cooked veal osso-bucco, and an ice cream dessert offering.
Anyway, I say go. Get away from the places on the square and come here. I don't think they take credit cards... Not sure... I paid cash.