This place was great for our stay in Rome. As others mentioned before, location is excellent. A very short walk to Campo de Fiori, very close to Piazza Navona, within a 10-15 minute walk you will reach many of Rome's attractions.
Nicholas took care of checking us in and out of the place, and he was great. We used the transfer service they provided from and back to the airport, and the service was excellent. Good cars, professional and careful drivers, showed up on time, highly recommended service.
The apartment is quite nice for up to a week stay in Rome, since you will be spending most of the time outside. Bathrooms were great, clean, great wifi, beds were comfortable, nice pillows. We thought it was great value for the money and the apartment was great for what we needed.
There are still some areas where the place can be improved. Personally I don't like the old style furniture, but that is personal taste, there is nothing wrong with the furniture. The only exception being the couch, which looked quite old and could definitely be replaced with a new one. The outdoor area is a small patio with views of the walls around it, but it was very disorganized, dirty and unkempt. It could be a great addition to the apartment, but in the state we found it it was simply impossible to seat outside for some time. The apartment has a system to get in and out where the main door opens with a 4 digit code, meaning you have no key. We would have preferred having a key, but the system worked fine while we were there. Finally, Via dei Cappellari and the alleys around it can be intimidating for some people not used to this type of street in Rome, especially at night. The street was always a bit dirty, broken glass on the ground, at night there wasn't much light. This wasn't a problem for us, and we never felt unsafe, others may react more strongly to this.
Overall I would recommend this place for a stay in Rome.