For culture, care and convenience, go here. The apartment is lovely and you'll be treated to a marvelous view of St. Castalus Church with St. Agnes Convent grounds (great medieval art exhibit) literally at your doorstep. For such a quiet area, one has ready access to whatever one would want to experience in Prague, from every-day convenience - to restaurants and night life. Old Town Square is a delightful and easy walk. So is the park across the river; so is Republic Square, the Spanish Synagogue (concerts) ... the list goes on and on.
During the month I stayed at Lucie's, at one point utility workers accidentally cut an electrical line into the building resulting in the likelihood that power could be off for a day or so. Lucie and Jakub promptly respnded to the inconvenience and paid for my overnight stay at a lovely hotel adjacent to the apartment. Very respnsive and, fortunately, the utility company was able to restore service by the next day.
I've stayed in Prague on three occasions recently. For location, comfort and convenience - hard to beat Lucie's.