Pretty large bottle selection, well organized by country, Czech section is in the back room and in the coolers up front. Helpful friendly staff. You can drink bottles next door or take them away, there's no room here to linger. In fact four people came in while I was there and that more or less filled the place since space is tight to begin with. Worth a look.
Next door to Zlý Casy, it's an essential stop if you visit it (or generally if you visit Prague, unless you simply cannot make it to Nusle). A medium to small sized fully packed store, ranging from cheap local lagers, through new Czech craft beer stars and rarities to a good selection of foreign beer. Helpful staff, friendly and certainly knowledgeable, though mistaking my "I'm on a budget and I'm looking to use it wisely" for "I want cheap beer" :D. Not his fault of course. Got a nice Raven IPA and had to hurry off. Next time I'll hopefully be visiting it without that big financial restraints. Enormous recommendation all in all.
Visited on 12th July 2017. Large bottle shop next door to Zly Casy. There a good range of beers laid out by country on shelves and a lot in fridges. Plenty of local stuff. Staff were helpful and sought out some Polotmavy for us. Prices were pretty reasonable. Definitely worth a stop.
Stopped in after a visit to the bar next door. Showed the helpful staff person a list of the RB top Czech beers and came away with 6 out of the top 10. Not a bad haul. They also had a nice selection of Brew Dog, deMolen and Emilisse, among others.