The apartment is excellent. Location is very central without being noisy at all.
The supermarket just downstairs is very convenient. Wifi was excellent, except for the kitchen.
The living room, kitchen and main bedroom are spacious and comfortable. The balcony is really just useful for smokers, it faces a rather dingy inner space between the apartments.
The mattresses are good, but note that the two small beds are quite hard, the one on the double bed is soft. Mattresses references are very personal, so this is just an observation to help other people, not a judgement.
Absolutely the best feature of this apartment is that it is assisted by the Hotel Bruno so that anything we needed to ask for was just there 24/7. Information, ordering a water taxi, checking things for us in Italia, recommendations. It was the perfect combination of the privacy and spaciousness of an apartment with the convenience of a hotel front desk.