The apartment has a really nice location, walking distance to the main attractions in Rome,
Nice and quite neighbourhood, many restaurants around, 20 min walk to Colosseum, 30 min walk to Vatican. Nice view from the window.
Spacious, nicely designed, Air conditioned, fully equipped kitchen with some water and snacks, washing machine with detergents and Iron.
Located in ZTL zone, so it is limited traffic zone, if you have a rental car it might be a problem, I still don't fully understand about all the rules of ZTL so you'd better check it yourself. I didn't have a problem since I arrived by taxi and left on my rental car on Sunday which is ok day to enter ZTL zone. I don't think you really need a car in Rome though.
I knew about the stairs to get to the apartment so it was ok for me, feels like you are getting on the third or forth floor. A little hard with luggage but it is not really a downside.
Definitely needs some improvements in the bathrooms, basically it is two bathrooms one with a shower and one with a bathtub (you can not take a shower normally standing in a bathtub, the length of shower head is not long enough and maybe it not meant to take a shower there). There is also problem with electricity fuses, every once in a while electricity goes off when you are using a lot of equipment and you have to go downstairs and turn it back on.
I fully understand that it is an old building and maybe those problems are not easily fixable especially with electrical part, maybe for someone it is ok, because the rental price is really attractable but I'd rather pay more that to live there with those little inconveniences, because other than that the place is REALLY NICE.
Matteo as a host was really nice and helpful.