We stayed recently at Alessandro's place and had 3 nice and pleasant nights in the room. The overall impression was very nice and we enjoyed being there even if there were some minor things that were not perfect... but first the positive experiences:
- Very good located with lot of nice restaurants in the neighborhood
- Fully equiped apartment/kitchen
- Bicycle rental just 20 meters away and very convenient
- Good communication with Alessandro and lots of helpful information in advance
- Room almost as new as it looks on the pictures

Some minor drawbacks of the flat:
- Quite clairaudient and thus a possible issue for people with weak sleep
- As it was known the bathroom is shared which might cause some surprises left from the not known guy next door
- No window in the bathroom and broken ventilation
- Even if communication with Alessandro was good the hand-over of the keys was not so good since we came early and the cleaning staff was not really aware how and where to store our luggage even if this was agreed with Alessandro.
- The building had the character of a hostel since all the apartments in the house are rent with airbnb.
- Unfortunately we did not meet Alessandro personally since it seems that he is only managing all the apartments in the building.

Summarizing, we do not want to criticize since we really had a nice and comfortable stay. But for somebody one of these minor issues might be a killing criteria.
Our recommendation: book the apartment, enjoy your stay and if you do it right you anyway just spend the nights in the room :)