It is really not in our habit to leave this kind of review, especially considering that Nina was very nice and welcoming, but we cannot recommend the apartment in its current state.
The neighborhood is a residential one, quite nice and busy during the day, but mostly dead at night. The apartment is located quite conveniently 2 minutes away from the subway (line 1 Salvator Rosa which goes to the city center and central station, but be careful if you want to change to another line because they are not all managed by the same company), but it is still a good 20-30 minute-walk from the historical center (where most restaurants are) and the last subway train runs at around 22:30 PM.
Though the apartment has clearly been renewed recently (the kitchen is especially nice), the space organization is inconvenient (the stairs to the upper floor where the bedroom is located are extremely narrow, and not suitable for children or elderly or large people). There is a balcony on the upper floor but the heavy traffic in Via Salvator Rosa can be very noisy. With the windows closed the apartment is fortunately quite silent and the air conditioning works really well (note that there are no shutters in the bedroom, only curtains, which can be inconvenient if city lights bother you when you sleep).
The main problem though is the humidity. The electrical dehumidifier, fortunately provided by the host, is clearly not sufficient: every evening it showed more than 80% air humidity and we had to let it run for three or four hours to reach 55-60% in the bedroom. It never reached less than 75% on the lower floor. This situation must have been going on for some time, because the air was difficult to breathe and there was a strong smell in the entire apartment, the linens were damp and smelly, and humidity stains are starting to show on the wall beneath the staircase and some furniture. The bathroom was really humid too: despite the mechanical ventilation, the towels were hardly dry from the previous day.
On a side note, though it may have been a one-time problem considering the other reviews, we didn’t find the apartment to be clean: the floor was dusty, the bathroom not thoroughly cleaned, and we even found some receipts left by a previous guest lying around.
It is really a shame since the apartment could be very nice and cozy in other circumstances and Nina is indeed very welcoming and available.