Unfortunately, there was a difference in meaning between American English and European English for the "Second Floor".
In America, the Ground Floor is called the First Floor and the First Floor is called the Second Floor.
We spent almost 1/2 hour trying to open or break into other people's flats.
Recommendation to the Owner to avoid future miscommunication that just simply uses " Second Floor(Top Floor)" or put a little door sign stating " Laura's Place"
Other than this for spending quite some time trying to open the door, everything else was lovely and we enjoyed it very much.
Thank you very much, Your place is wonderful and nice. We enjoy the beautiful city, eat the gourmet Italian food, learned the rich history, and stayed at your lovely place.
What else we can ask for? Right? Thanks again. We shall return.