Overall, it was a good experience and I can recommend it. Felice and Pao are lovely and communicative hosts who also respect your privacy.
The flat is spacious and bright and is shared with the owners and up to 4 other travellers. This was not a problem for us, we even spent a rainy evening in the living room.
The rooftop is amazing and we enjoyed having breakfast up there.
For the coffee capsules you are charged 1€ per coffee but if you buy your own, that would be no big deal.
My personal suggestion for the hosts would be to hire a cleaning person so that the shared facilities such as bathroom and kitchen can be cleaned more often (as I understand that you have occupations yourself).