Although the apartment and location were very good, Simplissimmo provided an appalling customer service (hence the one-star overall rating).
At check-in, they did not give us the key for the recycling bins in the basement. We asked several times that they provide that key to no avail. This resulted in the recycling bags piling up in the office space of the apartment during our 2+ month stay.
Although we were told at check-in that the same magnetic fob used to enter the building was also required to access the rooftop terrace, we very unpleasantly realized that the same key used for recycling was actually required to get back inside the building from the rooftop terrace. This resulted in us getting locked out on the rooftop. We called the Simplissimmo staff member Stephane to get help. He did not apologize once for his mistake and simply told me: “Who do you think I am, the concierge?” and suggested that we call the police (which we did). He eventually called the owner of the apartment. Somebody from the building was finally reached (either by the firemen who were dialing all occupants from the downstairs panel or by the owner of the apartment).
At check-out, Stephane from Simplissimmo very rudely said that I had a bad education when he saw the recycling bags and told me that I should have left the bags on the floor in the parking area of the basement. I replied that since this was a common area, leaving anything on the floor was probably against the building regulations and potentially hazardous. Again, no apology for omitting to provide the right key for both recycling and rooftop terracee. I asked to talk to his boss, to which he replied that he was the boss himself.
Before leaving, he threatened to write a very bad review on Airbnb. I took pictures of the apartment before I left.
Very good apartment and location, but Simplissimmo was a horrendously bad host.