Výčap (the name simply means "tap" in Slovak) is a reliable craft beer bar on Obchodná Street, one of the main commercial streets leading north from the old town. The bar focuses on Slovak and Czech craft beers, with a rotating selection of around 10 taps and a well-stocked fridge. Prices are reasonable and the crowd is a mix of locals and visitors.
Obchodná Street is a good street to explore on foot — a mixture of small shops, cafes, and the kind of tatty commercial activity that keeps a city feeling real. It connects the old town to the main train station district and is less touristic than the streets within the old town walls.