Stayed here in November and enjoyed the stay except for the cigarette smell throughout the apartment, which was pervasive for the 5 days of our stay despite keeping windows cracked for days.
Pros: Superb convenient location in central old town, easy walk to all the sights, public transit (Namesti Republika), Grocery store (Albert), Deparment Store (Kotva), and loads of restaurants. Nice apartment - Comfortable beds, sound proof windows, good heating, clean and modern kitchen, great bathroom. Kitchen was mostly well equipped (basics were covered; could use a larger cutting board and the nonstick pan needs replacing). Spacious rooms, very clean, nicely decorated with a nod to local art styles. We found it easy to communicate with the hosts via WhatsApp and they met us within 15 minutes upon our arrival and were happy to provide local tips.
Cons: I hope they can get rid of the cigarette smoke smell and better enforce no smoking. Also, because of the central location, and the second floor proximity to the street, there is quite a bit of street noise coming from the tourists passing by. This was not a problem when the double pane windows were closed. If I were there in summer, I would wonder if the place were too hot with windows closed, and whether the noise would be an issue.