The fact is that the flat gives onto a small street which is extremely noisy. Musicians with loudspeakers until 10 or 10:15 at night, Restaurant open until midnight and crowds of drunken partying tourists screaming until 5 o'clock in the morning or puking under the window. So either you close the windows and steam (and still hear half of the noise) or let the windows open and hear everything. In any case expect to barely sleep. It is extremely frustrating to pay 500 euro for three nights and start the day exhausted. Slightly better (or less bad) on thursday night, unbearable on friday and saturday night. THIS SHOULD BE DISCLOSED in the listing to make a honest description of the flat.
In addition the bedroom - situated directly by the entrance of the flat- does not hermetically close. It is separated from the entrance with walls that do not go up to the ceiling and with a sliding door which does not fully close. As there is a glas above the entry door, as soon as someone turns on the lights in the stair case, it is bright in the room and you wake up.
What a pity, the flat is nice, well decorated with a nice bathroom and kitchen. The view over the city is amazing. But at the end we spend €500 euros for a terrible sleep. So if you are not planning to party the whole night, I would avoid this place.