The location was very good, within walking distance of the river, Kampa Island and Prague Castle, with Old Town just across the river on the less crowded bridge south of Charles Bridge. The part of Mala Strana where the building was located had far fewer tourists than places like Old Town, which was a blessing.
The apartment was excellent: well furnished and quiet; double windows kept out street noise. The staff at the office on the ground floor were friendly and resolved quickly a minor issue with wifi.
There was a cafe on the ground floor and a supermarket around the corner. Good restaurants nearby included the Czech-Slovak Restaurant and Cafe Savoy.
The building was close to a streetcar route, though the metro was some distance away. (Closest were Narodni Trida station, with a short walk across the river, or Andel station on the Mala Strana side.) Since walking around the city was enjoyable, the metro location wasn't a drawback for me.