We had a great stay. It is so central that you can easily go home at any time which is good in this busy, chaotic, yet beautiful city. The airco works well and in my opinion it is a matter of life and death. Two of the rooms are even nice and quiet, not on the street. Fredrik and his wife are exceptionally nice people. Helpful, informative, and they have their work place just round the corner from the apartment which is convenient.
There are three flights of stairs to get to the front door which is a bit of hassle if you travel with large heavy suitcases but did not bother me at all otherwise. The place was less spacious than we had thought from the description but just fine for us - 8 adult women attending a conference in Florence. With four bathrooms in total, three in three of the rooms, there is no hassle in the morning.
Thank you Fredrik and Annarita we loved our time in your place.