Sacrifice the location for something more quiet and hospitable. When we arrived at 9pm the man behind the counter acted like we were interrupting him. He was brusk when he did speak and didn't explain anything about how breakfast worked like a normal place that provides breakfast does. The towels were like sand paper, there wasn't any toilet paper in the room the first night, there were dead bugs in the cabinets, and there wasn't enough hot water for the second person taking a much needed, relaxing shower. Our sleep was terrible because the door didn't block any sound and they put us in the only room that was outside of the reception area by the elevator on the first floor. We could hear everything happening outside of our room.

Caput Mundi is very close to the train station Roma Termini, it is very comfortable, but, unfortunately, it is the only good thing about the hotel.
Seriously, I couldn't have imagined that it would be like this. Let's start with bad points. The room was not cosy, tidy or comfortable. You could've seen dirt in it. Once I've seen the cockroach! Brrrr. There was not everyday cleaning either. The bed was unpleasant, like all the other furniture. The climax of my discontent was the bathroom. If you are not the one who want to take a shower, you should wait until the heater is ready. Also, our room was on the 1st floor close to the public bathroom, and the heater was the one, so in the morning it is simply impossible to take a warm shower.
About tranquility. During the evenings I often heard shouts of foreigners in different languages, cause it is not the best quarter in Rome. I suppose, that is the reason of absence of view from the room. The window was hammered. Also, we had couple of mornings, when there was pretty noisy at the hotel. The receptionist told us that there were "special days", when she was shouting at some workers. The noise from the workers also was rather appreciable.
The breakfast was in the room, as they didn't have space for it, but it is very poor and the same all the time.
The staff was good for us. There were Russian girl Katya during some days who spoke Russian, English and Italian and was very nice, friendly Italian man during some nights and unfriendly Italian oldman during other nights. Some people wrote that he was a real nighmare, but we hadn't any problems with him. Do not speak English with him, say him "Buona notte", and he will be glad. But best of all do not choose this hotel planning your trip to Rome, yeah, it is rather cheap, but don't.

Hotel really well located, but have to improve a lot. The first night we have to sleep in a room behind the reception, so the noise was awful and we couldn't sleep...the other 3 nights we sleep in a room that was OK...

The pstaff as very helpful and friendly, but the structure of the hotel must be improve and modernize a lot!!!!

great location awful hotel nothing like the web site stayed on fifth floor no air con no hairdryer no bar no lounge no dining room all of which advertised my daughter paid as a present but they would not let us leave until we paid cash for the stay as they said we could not use her card, most rude and said we could not sign although my daughter had given all her details and they had accepted the payment