Great apartment... Lots of space for a family of 5 with great common spaces for a vacation home. The building itself was quiet and we felt safe. Top quality appliances and well-equipped kitchen. We were within walking distance of the Petrin tower, Charles Bridge, Wenceslas square and Old Town square with great accessibility to the trams (multiple lines that stop nearby).
Street noise can be heard at night in the common space and front bedroom - mind you we stayed over the Christmas celebrations which might have led to a bit more "festive" mood in the city.