The idea was to organize the interior spaces so as to obtain a better functionality and brightness in the rooms that originally lack in rationality and reveal the speculative origin of the building that was characterized by narrow and dark spaces. The project focus is the realization of the rough iron stairs with a combined bookshelf made by design and the new bathroom that is contained in a standing alone box of 2.40 mt high, that is positioned beside the stairs. On the top of the box floor there are some hidden lights that make it similar to a lantern. The artificial light is made by some vertical light cut placed in the stairwell and in the bath box. The stairs and the box operate as a filter between the bright kitchen and the more intimate dining room. The new kitchen look toward south to the 20 sq mt terrace and it’s delimited by glass walls that allow the light to filter to the upper floor. The apartment is very bright thanks to the big sliding French doors and the glass walls that allow the light to pass through the rooms. Moreover the choice to use the same wood flooring for the whole flat makes very fluent the space perception. On the first floor there are two single and one double bed rooms with two bathrooms. Furthermore there is a little office obtained on a mezzanine floor positioned 4 stairs above the night floor.