Me and my friends really liked the apartments location, because Campo de' Fiori is nearby where you can find to buy groceries and fruits in the morning, and in the evening you can sit in one of the many restaurants. (We really enjoyed pizzas in "Mercato Hostaria Roma"). What's more, the flat is located 1-3km from all famous tourist places, so you are able to walk in all directions: to Trastevere, Pantheon or Colosseum and etc. I think it is important, because the public transport in Rome is unsatisfactory - you never know if the bus will arrive or not, and you have to stop it by yourself.
The apartment itself was great, it was spacious, well equipped, we found everything we needed during our stay. Unfortunately, we struggled with the shower, because sometimes there would be no hot water in the evenings, and in the mornings we had to wait for several minutes in order to have hot shower. The water stream was also disappointing, but maybe there is a problem in the whole Italy, because we had this same problem when we stayed in Milan a few years ago. Also, it was really difficult to open the door (it was heavy) to the apartment. The struggle was real and during the whole stay only one friend was capable to open it :D
Nevertheless, we enjoyed our stay in Rome and overall we were satisfied with the apartment, i just thought i will write these disadvantages for the future guests so you could make the right decision suitable for you.
Huge thanks to the host for everything! :)