The apartment is in a very good location and what felt like a very safe area. However you should be aware of the following:
1) There is only one small A/C console to cool the whole apartment and it takes at least a couple hours to cool the whole space (specially in the sleeping area that is on a second level). At first the AC was actually not cooling at all, and when I checked the filters they were very dirty. After cleaning them it started to cool a little but I feel that the cubic feet of the space is too little for that console to make up the extremely hot summer weather.
2) The response time of Federico was not the best -at least that was our experience. In some instances he took several days to answer my messages and that happened more than once. Communication should be better with a host.
3) The property description says it is located in a 3rd floor, but FROM THE GROUND it is actually a 4th floor. The building is actually a historic property and has stairs that are fairly steep, so be aware of that.
Other than that, we were able to enjoy our time in Rome.