Advantages:
+location and close proximity to various means of public transportation, including metro
+loads of bars and cafes in the area in which you can get delicious breakfasts (most notably Gatsby Cafe and Bar Trani)
+low price
+access to a fully equipped kitchen
+air conditioner
+Wi-Fi
+contact with Patrizio and Christian
+check-in process
+the area felt rather safe so don't really trust what you can read online about the Termini neighbourhood. It didn't feel dodgy at all even very late in the evening.
Downsides
-the room itself is quite barebones - you get a bed (a large one, comfortably for two people), a table, three chairs, a closet and a small safe
-out of four power sockets in the room only one works and it's the one the farthest away from the bed (there is a power strip though so you're not limited to only one socket at the time)
-the water output in the shower leaks terribly and overall the water pressure is very low - combination of the two means that what you get from the shower handset are two or three little streams of water instead of the usual "rain". Far from enjoyable experience
-very noisy street outside the window
-you don't get a duvet - instead you get a second bed sheet and a bedcover (like a blanket that you place on top of the duvet when making the bed)
-probably the most notably - mold in the bathroom. The bathroom is at least ventilated with an electric vent that turns on with the light so it shouldn't be harmful if you stay for a week or so. Keep that in mind though if you have any respiratory illnesses
In summary - I can surely recommend this place if you are on a budget and you just want a place where you can sleep and rest between the days full of travelling and visiting tourist attractions in the beautiful Eternal City. It serves this purpose really well. However, if you value comfort and you are willing to spend a little bit extra, you might need to reconsider this choice.