Despite an unassuming exterior, the hotel is surprisingly roomy, and includes several extras (a roof garden, an upstairs lounge with Wi-Fi, original artwork). The property is nicely done, with vintage and modern features, and my room had a long vestibule and dressing area that made it feel more like a suite. The premises are very quiet, despite being on a touristy street. They serve a nice breakfast. Hotel staff were very helpful, arranging for a post-stay airport transfer, the use of their Wi-Fi lounge while I waited for the driver, and translation of Czech keyboard (of all things, the @ symbol is just out of reach to US keyboard users).
The only drawback is that the street gets crowded as the weekend approaches. But the steep hill and narrow road keep traffic to a minimum, and it's an easy walk to both the Castle and the Little Quarter.
I'd definitely stay there again.