Karel's place has a great location, right next to a metro station, train station, and the National Museum, and the street it is on is quiet. In any case, the apartment is facing an inner courtyard so any possible noise from the street is not an issue. The apartment was clean and had all the necessary things you'd need during your stay, and if you were to buy food, there are many grocery stores to choose from nearby. Most importantly, communication with the hosts was easy, facilitating a stress-free visit to Prague.