The place was nice and clean and the location is perfect for a couple of days in rome. Piramide Metro station is a couple of minutes away and there are several busstops around. We also walked a lot. I would think the colosseum is about 30 minutes on foot and there is stuff to see in between like the Piramide and the protestant cemetery.
As others have already observed, the appartment is located in a very lively area. The fact that everything is very old in Rome is both a blessing and a curse. Because of the lack of a proper winter, there are no modern double glazed windows, so the sound isolation properties of the windows are essentially zero. Add the fact that Italians as a people are generally louder than most northern european people and their driving seems to mainly consist of honking their horns all the time, you will be well advised to bring some earplugs! But that is part of the real rome experience, really.
The kitchen has a typical gas stove and is equipped to make some proper roman pasta! Don't miss out on that! The Testaccio Market and the Eataly fine italian food mega store are both in walking distance. But also the run of the mill supermarkets offer amazing quality. If we hadn't planned on sightseeing and eating pizza a lot, I would have spent all my time cooking. You will simply not find food of that quality anywhere else, period.
There are great restaurants around though, so if cooking is not your thing, you won't go hungry. Other reviews also recommend the gelateria one street corner over, which we can only second.
Another thing to mention: If you are worried about issues with the old italian power sockets, the sockets fit Euro plugs as well and there are several modern Schuko style sockets and even some adapters available in the appartment.
All in all we had a great time in Maurizio's appartment and would visit again!