This accommodation is ideal for people wanting to sleep close to Termini. It is right by the station, and Xiuping was very sweet. I arrived rather late in the evening (after 11 PM) after some delays with my flight, but there were no issues with check-in. The flat feels more or less like a hostel, so if you are looking for something more upscale, then this probably isn't for you; on the other hand, if you just need a place to sleep and want something clean, convenient, and economical, it is a great choice.
Just an FYI--if you arrive to Termini later in the evening, the exit that Xiuping instructs you to use to leave the station will be closed. In this case, you will have to leave the station from the main exit and walk up via Giolitti for a few minutes before reaching the building. The area around Termini isn't the nicest of places, so be sure to pay attention to where you are going!