This apartment is BEAUTIFUL! We saw the pictures here on airbnb and were impressed, but when we entered the space, we were blown away. However, there are a few things of which one should be advised before booking.
The neighborhood is a little sketchy (a lot of homeless people, graffiti and trash everywhere outside). You can walk to and from Termini station (which takes about 15 minutes), but be aware that sections of that walk are very dirty/smelly, so you may want to take a cab. However, we had no problems on the walk, other than the smell, and actually quite enjoyed the exercise.
If you are staying more than a couple of days, you WILL need to purchase your own toilet paper (they only provide enough to "get you started", which seems a little cheap, since you're paying a decent amount to stay there each night. I really was surprised when I messaged the hostess asking for more and was informed we would have to go to the supermarket and buy it.) . You will also need to wash your towels, pretty much every day, (they provide ONE bath towel and ONE hand towel for each person NO WASH CLOTHS). Everything else is locked away (literally with a chain and padlock), in the kitchen.
Upon check in, we were not informed that a section of the shower door was missing. The second or third night into our stay, I discovered that my parents, who were staying in the other room, had been using the main bathroom at night to shower, because the door was broken and they didn't want to get water everywhere trying to take a shower. I messaged Marta and politely requested a partial refund as two, usable showers were what was advertised. Instead, she informed me that the previous guests had had no problem using the shower, despite missing part of the door and asked if she would be able to come in to the apartment sometime during our stay and fix the problem. The next day there was a curtain in place and the shower was usable once again. She was very apologetic and we were pleased that the situation was remedied. We only wished that we had been informed at check in.
But all these things are just side notes. The apartment was TRULY STUNNING. We LOVED it and Marta was a gracious hostess. We would stay again!!